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Deployment metrics for different tracking types

17

Nortel WLAN - Location Engine 2340 Configuration - Using Interfaces

Deployment metrics for 

different tracking types

This chapter explains the most common types of location tracking and how the type of tracking dictates:

•

the size and number of Locales that can be created

•

the number and configuration of Location APs that can be deployed

•

the number of RF Fingerprints required

For best results, these deployment details can be determined by a site survey conducted by Nortel.

Deployment types

The most common types of location tracking are:

•

Asset Tracking

•

Content Delivery

•

Access Control

A deployment may use different types of tracking based on the unique requirements of the deployment or the applications 
used.

Asset Tracking

An asset tracking deployment is generally concerned with tracking asset tags, devices that beacon on multiple channels 
and are inside the physical perimeter of a building. For instance, to find if people with Wi-Fi badges (a type of Asset Tag) 
are inside the building at the proper times (or have evacuated a hazardous area).

Deployment types   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  17

Asset Tracking  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  17

Content Delivery   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  19

Access Control  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20

Содержание 2340

Страница 1: ...Part No NN47250 504 324122 A October 2007 4655 Great America Parkway Santa Clara CA 95054 324122 A Nortel WLAN Location Engine 2340 Configuration Using Interfaces ...

Страница 2: ...Computer Software Restricted Rights clause at FAR 52 227 19 Statement of conditions In the interest of improving internal design operational function and or reliability Nortel Networks reserves the right to make changes to the products described in this document without notice Nortel Networks does not assume any liability that may occur due to the use or application of the product s or circuit lay...

Страница 3: ...1 Device tracking concepts and features 13 Tracking Engine 13 Tracking Precision 14 Locales 14 Location APs 14 RF Fingerprints 14 Calibration 15 Evaluator 15 Walkthroughs 15 Deployment metrics for different tracking types 17 Deployment types 17 Asset Tracking 17 Locales 18 Location AP Placement Density 18 RF Fingerprints 18 Content Delivery 19 Locales 19 Location AP Placement Density 19 RF Fingerp...

Страница 4: ... Re setting the admin password 24 Nortel WLAN Location Engine 2340 Web GUI 25 Launching the WLAN Location Engine Web GUI 25 Deploying the Location APs 26 Location APs 26 Editing adding and removing Location AP 27 Associated agent 28 Placement guidelines 29 Calibrating the Tracking Engine 31 Locales 32 Channel scanning 34 RF Fingerprints 34 Evaluating Calibration 37 Location APs malfunctioning 38 E...

Страница 5: ...ies 48 Specifying SNMP properties 49 System Alerts 50 Configuring Alerts 51 Nortel WLAN Location Engine 2340 Dashboard 53 Hardware requirements 53 Software requirements 53 Connecting through HTTPS 53 Device lists 55 Filtering the list 56 Using the Nortel WLAN Location Engine 2340 Dashboard 56 Installing WLAN Location Engine Dashboard on windows systems 56 Creating a layout 58 Using the New Layout ...

Страница 6: ...6 Contents NN47250 504 324122 A Version 01 01 Choosing Layout Elements to display 72 Choosing Devices to display 72 Showing association lines 72 Highlighting devices 72 Saving changes to the View tab 74 ...

Страница 7: ...wnload software documentation and product bulletins search the Technical Support Web site and the Nortel Knowledge Base for answers to technical issues sign up for automatic notification of new software and documentation for Nortel equipment open and manage technical support cases Getting help over the phone from a Nortel solutions center If you don t find the information you require on the Nortel...

Страница 8: ...outing Code ERC to quickly route your call to a specialist in your Nortel product or service To locate the ERC for your product or service go to http www nortel com erc Getting help through a Nortel distributor or reseller If you purchased a service contract for your Nortel product from a distributor or authorized reseller contact the technical support staff for that distributor or reseller ...

Страница 9: ...e tracked capturing the RF data necessary to create a fingerprint for each locale running the Evaluator to determine the usefulness of captured RF fingerprint data and walking through the site to verify tracking accuracy It also explains the User Interface for the Nortel WLAN Location Engine This includes system summary information device monitoring Location AP configuration tracking setup and cal...

Страница 10: ...you enter or items you select Italic text Designates command variables that you replace with appropriate values or highlights publication titles or words requiring special emphasis Menu Name Command Indicates a menu item that you select For example File Connect indicates that you select Connect from the File menu square brackets Enclose optional parameters in command syntax curly brackets Enclose ...

Страница 11: ...Introducing the Nortel WLAN Location Engine 2340 11 Nortel WLAN Location Engine 2340 Configuration Using Interfaces Nortel WLAN Location Engine 2340 configuration workflow ...

Страница 12: ...12 Introducing the Nortel WLAN Location Engine 2340 NN47250 504 324122 A Version 01 01 ...

Страница 13: ...ibration the process whereby the Tracking Engine collects RF Fingerprint data The Evaluator which verifies that the Calibration captures enough useful data Walkthroughs in which Tracking accuracy is verified Location APs Access Points used to detect and report 802 11 traffic Tracking Engine The Tracking Engine based on patented technology powers the Nortel WLE2340 It recognizes the locale of each ...

Страница 14: ...500 square foot room or a 20 000 square foot warehouse The number of Locales you create can be named as many as required discrete Locales to match the precision level of tracking that you are implementing Locale names correspond to buildings floors departments or rooms For example for room level tracking precision you create one locale for every room Location APs The Nortel WLE Tracking Engine rel...

Страница 15: ...nning the Evalu ator fixing the flagged problems and rerunning the evaluator can be repeated until the Evaluator does not detect any critical problems Walkthroughs To catch any remaining accuracy and to detect all latency problems it is necessary to perform a test run of the system with live wireless devices called a walkthrough When you perform a walkthrough you do not have to test every square i...

Страница 16: ...22 A Version 01 01 problem This is as simple as the creation of a few additional RF fingerprints at the transition point or it can involve setting some advanced system parameters that adjust the Tracking Engine s internal representation of a locale s borders ...

Страница 17: ... by a site survey conducted by Nortel Deployment types The most common types of location tracking are Asset Tracking Content Delivery Access Control A deployment may use different types of tracking based on the unique requirements of the deployment or the applications used Asset Tracking An asset tracking deployment is generally concerned with tracking asset tags devices that beacon on multiple ch...

Страница 18: ... border the outside When using this density of Location APs in a deployment typical precision and latency numbers can be expected in the range of 5 meters within 3 minutes RF Fingerprints The minimum number of RF Fingerprints required are One RF Fingerprint for every 3 000 square feet Two additional RF Fingerprints per entrance one inside and one outside Four additional RF Fingerprints outside the...

Страница 19: ...ess accuracy a less dense deployment is required The Location AP placement restrictions are Use at least four Location APs per building this ensures accurate tracking Do not install a Location AP within 10 feet of an outside wall Do not install Location APs near windows or other expanses of glass that border the outside When using this density of Location APs in a deployment typical precision and ...

Страница 20: ... The general guideline for building level perimeter tracking is one Location AP for every 3 000 to 4 000 square feet of space In addition for each building make sure that there are two APs within 50 feet of the building entrance or exit For deployments that require maximum security deploy Location APs outside as well for example on awnings As you test the deployment with walkthroughs you may find ...

Страница 21: ...empt to access the Nortel WLE2340 Administration GUI for the first time it will offer a form for the first user and password This user is added to the admin role automatically Nortel WLAN Location Engine 2340 Initial Administration GUI 21 Initial Administration GUI Access 21 Initiate Login 21 Note Before logging to Initial Administration GUI you have to setup the WLE2340 For more information about...

Страница 22: ...e set ap ap_number boot configuration switch switch switch IP address set ap ap_number boot configuration ip ap_static_ip_address netmask netmask gateway gateway IP address mode enable Steps to set snoop mapping recommand snap length is 100 set snoop snoop name oberserver WLE 2340_ip_address snap length snap length set snoop map snoop name ap ap_number radio 1 or 2 set snoop snoop name mode enable...

Страница 23: ...group each with their own username and password Doing this allows these users to access any page Creating a new administrator login using the system users page To create the administrator login follow the below steps 1 Navigate to the System Users page and click Add 2 Update the default name New User with the login name of the user Enter the user s Full Name the password and the password confirmat...

Страница 24: ...reset the admin password on the WLE2340 in the event of a forgotten password or other password change scenario you have WLE2340 console port access To do this follow these steps 1 Connect a serial cable to the WLE2340 console port 2 Login at the console as admin password is not required 3 Press a key ESC before being presented with the login prompt 2 second timeout 4 Press the Y key when prompted ...

Страница 25: ...e Nortel WLE2340 through web GUI Once you enter the web GUI you can access the following Summary Monitor Calibration Configuration System Launching the WLAN Location Engine Web GUI To launch the WLE2340 Web GUI follow the below steps 1 To access the WLAN Location Engine Web GUI enter the following URL in the browser https Web_IP_Address The following screen appears ...

Страница 26: ... RF data during calibration and monitor the airwaves for 802 11 based devices and assets This chapter explains the following Location AP deployment tasks Location AP Status Manual Location AP configuration Binding each Location AP to its respective Agent Location APs The Configuration Location APs shows the list of registered Location APs and their status Location APs that are configured to use th...

Страница 27: ...n AP After correcting a malfunctioning Location AP refresh the page to verify that the status is green If not check with the network administrator to verify that the network port is live You can also use the Refresh Location AP Status at the bottom of the page to get periodic updates of Location AP status Editing adding and removing Location AP You can edit add and remove the location AP To do thi...

Страница 28: ...move Associated agent The Nortel WLAN Location Engine has one Agent process and all Location APs can be associated with it automatically However it may be necessary to configure this manually Assigning Location APs to an Agent on the Tracking Agents 1 Select Configuration Agent The Agent Information panel updates to include the information for the selected Agent The following window appears Note P...

Страница 29: ...e area to be secured and the type of tracking precision required But regardless of the number of Location APs or tracking precision there are two general guidelines for how Location APs can be positioned in relation to one another A Location AP can not be placed such that two locales are mirror images of one another with respect to the Location AP The goal is to create as much asymmetry as possibl...

Страница 30: ...he middle of the border between Locale 1 and Locale 2 makes the two locales appear identical to that Location AP Moving the Location AP to an outside edge as in the diagram on the right removes this symmetry creating a distinct RF pattern for Locale 2 Scenario 2 Placing 1 Location AP in the center of Locale 2 and another in the center of Locale 3 makes Locale 4 look like Locale 1 Moving the Locati...

Страница 31: ...ocess is referred to as calibration The calibration of your site is an iterative process 1 Create enough RF fingerprints to achieve the granularity of device tracking you require in each part of the area under surveillance inside or outside the physical perimeter in a department in a room 2 Use the Evaluator to examine the calibration for problems such as missing data conflicting data inconsistent...

Страница 32: ...which to scan during calibration Creating and capturing RF fingerprints Running the Evaluator to determine the usefulness of the captured data Selecting the 802 11 band s to monitor for the walkthrough Verifying device tracking with a walkthrough Locales Each locale needs to be named so that the name is available for binding the RF fingerprints which form the locale s fingerprint when the calibrat...

Страница 33: ...sociating RF fingerprints to locales RF fingerprints can be bound here or after calibration on the Calibration RF Fingerprints Page In the Locale Information column replace the default name New Location with the actual name of the locale and enter an optional Description It is helpful to use a naming convention that makes it easy to distinguish between locales and RF fingerprints 4 Click Save It i...

Страница 34: ...rom the person who is selecting the locale and RF fingerprint names An RF fingerprint is considered empty until the RF data that characterizes it has been captured To capture RF data for each RF fingerprint the personnel responsible for the calibration phase of the deployment can physically walk through the area to be monitored Nortel recommends holding a wireless device broadcasting on the scanne...

Страница 35: ...ns and calibration controls are added to the RF Fingerprint Information column 3 In the RF Fingerprint Information column replace the default name New RF Fingerprint with a name that describes the location of the RF fingerprint for example mailroom nw 4 Select the correct Locale from the Bound to Locale drop down list An RF fingerprint can be bound to only one locale 5 Enter the MAC Address of the...

Страница 36: ...e Tracking Engine creates during calibration By turning in place you ensure that the Nortel WLAN Location Engine Tracking Engine creates a very strong representation of the center of the RF fingerprint For the remaining 50 of the calibration as indicated by the flashing Progress label walk in a circle to vary the signal strengths received by nearby Location APs The size of the circle for smaller s...

Страница 37: ...y be named as either an XML or TXT document The format for the Import file is as follows Use as many signature elements as desired Evaluating Calibration After calibration is complete an evaluation report can be created on the Calibration Evaluation page Select the Locales to evaluate and then select the Run Evaluator Note The description attribute can be blank but each name can have a value and t...

Страница 38: ...Empty RF Fingerprints The Calibration RF Fingerprints page allows you to name RF fingerprints and bind them to locales before calibration so that the capturing of RF Fingerprint data can be handled by a different person from the person who is selecting the locale and RF Fingerprint names This opens up the possibility that some RF Fingerprint names will be entered into the system but the Tracking E...

Страница 39: ...To test the ability of the Nortel WLAN Location Engine Tracking Engine to transition you from one locale to another based on the RF Fingerprint data collected during the Calibration phase you walk through all locales holding a wireless device Simply connect to the Nortel WLAN Location Engine Console and the Monitoring section to see where the device is tracked during the walk through see Fine tuni...

Страница 40: ...ed because of RF resemblance to actual locale Adjacent Locale misreported If the Nortel WLAN Location Engine Tracking Engine incorrectly reports your position as being in an adjacent locale your first approach can be to make sure that there are RF fingerprints on either side of the transition point between the two locales Wrong side of border reported If you are standing near the edge of a locale ...

Страница 41: ...tel certified asset tags are enumerated separately from clients as another device type Consult with Nortel Professional Services for supported list of certified asset tags Network Summary The number of networks clients associated with a network and unassociated devices Device Summary Nortel WLAN Location Engine devices The number of Agents and Location APs Device List page The Device List Page pre...

Страница 42: ...e Select the next to the device s label to display the Device Detail page See history for a device Select the next to the device s label to display the Device History page Edit a device s information Select the next to the device s label to display the Device Information dialog See other clients on same Access Point For each CLIENT device associated with an Access Point the MAC address shown in th...

Страница 43: ... to identify devices on console pages and in reports replace the default label with one that is more descriptive for example Lobby AP 6 Click Save Device Detail page To display the Device Detail page for a device on the Device List page select the next to the device s label The type of information presented on the Device Detail page depends on whether the device is a Client or an Access Point The ...

Страница 44: ...thin 140 seconds Recent Locales The Recent Locales tab presents a table containing one line for every locale the device has been in since it began trans mitting For each locale the device has passed through the system shows the time the device was detected in that locale the time the device left that locale and the total time the device was in that locale Network Associations The Network Associati...

Страница 45: ...ew start and end dates and times You can also display the history for a different device by entering the MAC address for that device Alert List The Monitor Alert List page will show any current System Alerts and also offers a form to query alerts during specific periods of time There are two categories of system alerts currently supported in the Nortel WLAN Location Engine Internal system alerts A...

Страница 46: ...e the System Alerts to use the established Notification mechanisms Email Sysleading2og and SNMP Trap System Alerts are classified as follows Critical High Medium Low Info Each type can be delivered by one or all three of the following email syslog SNMP V2 or V3 trap Use the System Settings Page and Notifications Tab to Enable Notifications for Alert Levels 1 Navigate to the System Settings page an...

Страница 47: ...ose one or more delivery mechanisms by selecting any combination of Email1 Email2 Email3 SNMP1 and SNMP2 Specifying Syslog properties Using the System Settings Page as shown below Notifications Tab to Specify Syslog Properties Syslog Hostname The IP address of syslog server Syslog Facility Name The facility to which alerts are sent usually local3 ...

Страница 48: ...ts can be delivered to 3 email addresses as shown below SMTP Host The IP address of the mail server Email Recipient The email address that can receive all email alerts Email Name Suffix The suffix that can be appended to the email name Reply To Address The email address that can appear in the header of the alert ...

Страница 49: ... community name here as on the destination host SNMP Version 3 Use Authentication Check to guarantee that the trap is coming from the Nortel WLAN Location Engine to thwart spoofing Use Privacy Encryption Requires Authentication Check to guarantee that the trap cannot be intercepted Authentication Protocol Specify the same protocol as on the destination host Username Any valid username on the desti...

Страница 50: ... is not visible to the server due to a network problem or a malfunctioning or unplugged device Inspect Location AP and or network to determine source of problem After correcting a malfunctioning Location AP refresh the Configuration Location APs page to verify that the S status is green If not check with the network administrator to verify that the network port is live N A Location AP Up A previou...

Страница 51: ...uring Alerts To configure the alerts 1 Navigate to the Settings System Alerts page The table on the page lists the system alerts that have already been turned on if any The below figure shown the Location AP Down alert is configured already 2 Click Add Alert to add a new Alert The Alert Configuration Dialog appears ...

Страница 52: ...nue A properties window for the alert appears 4 Select the Priority from list and click Save Note Alerts are removed from the Alert Configuration dialog list if they are already configured If all System Alerts are configured then the Alert Configuration dialog may show an empty list The next section discusses how to edit or remove existing alerts ...

Страница 53: ... Nortel WLE2340 At each subsequent startup of the Nortel WLE2340 Dashboard the connections are re established automatically Hardware requirements For Windows the recommended standard configuration for each machine are as follows Pentium III 1 0 GHz 512 MB RAM 200 MB free disk space Software requirements Following are the Certified Operating Systems XP Service Pack 2 Microsoft Windows 2000 Connecti...

Страница 54: ...alizing Server Connection wizard appears During the connection process information about the devices locales and networks being tracked by the Nortel WLAN Location Engine is loaded into the Dashboard 4 Click plus sign to expand the hierarchy Following options are available Layouts Shows all the layouts you have created previously with the Dashboard A layout is a floor plan map on which the Dashboa...

Страница 55: ...and in all locales Locale Just the devices in the selected locale Network Just the devices in the selected network By default all powered devices within range of the specified wireless network are listed The list can also be filtered to show just active or inactive devices An active device is one that is powered on and has transmitted within the period specified by the Inactivity Threshold paramet...

Страница 56: ...devices only for the specified network grayed out when the Device List was generated for a single Network All Active Inactive Devices display all devices active devices only inactive devices only Label MAC display the devices whose Label MAC contains the specified alpha numeric string For more information on Creating the layout see the chapter Creating the layout Using the Nortel WLAN Location Eng...

Страница 57: ...e You can enter the complete qualified path of the new directory The path cannot contain spaces Select Restore Default Folder to re enter the default directory in the text field 4 Click Next or select Choose Shortcut Folder The Choose Shortcut Folder wizard appears You are prompted Where would you like to create product icons Choose one of the following In a new program Group In an existing progra...

Страница 58: ...s live views of the Wi Fi activity in the physical area represented by the layout To create a layout 1 Use the Layout wizard and import a floor plan image gif jpeg or png 2 Use the Locale Rectangle Tool or Locale Freeform Tool to draw the Locales on the layout Associate the drawn locales with the actual locales tracked by the WLE2340 3 Use the RF Fingerprint and Sensor tools to place icons on the ...

Страница 59: ...ils Select Background Image Set Layout Size Enter Layout Details 1 Enter the Name of the physical area represented on the layout for example Floor 1 This name appears on a tab for easy identification of the layout 2 If you invoked the wizard by selecting then enter the URL of a Connection to a Nortel WLE2340 or Platform server in the Connection field otherwise this field is pre filled and grayed o...

Страница 60: ...60 Nortel WLAN Location Engine 2340 Dashboard NN47250 504 324122 A Version 01 01 3 Enter Description 4 Click Next to advance to step 2 Select Background Image ...

Страница 61: ...he physical area represented by the named Layout 1 Enter the File Name or browse for the file using the Look in and then select the file name 2 Click Next The Set Layout Size wizard appears 3 The default width and height is displayed in the Size panel Optionally you can enter new width and height dimensions to expand or contract the image 4 Click Finish to save the Layout The image is loaded onto ...

Страница 62: ...iews of live device activity and associations in the correct locale on the layout To use Locales tools You can use the Locale Rectangle Tool to draw and shade an area on the layout that demarcates each physical locale being tracked by the Nortel WLE2340 1 Click Locale Rectangle Tool in the Tools Palette and move the mouse cursor to the position on the layout that corresponds to a corner of the phy...

Страница 63: ... layout that demarcates each physical locale being tracked where a polygon shape represents the physical location depicted 1 Click Locale Freeform Tool in the Tools Palette and move the mouse cursor to the position on the layout that corresponds to a corner of the physical locale 2 Click the left mouse button and begin dragging the mouse toward the next corner of the desired polygon of the Locale ...

Страница 64: ...y default the label for a locale is displayed at the top center of the Locale s bounding box Once the locale has been drawn you can move the label independently of the locale placement This is helpful when the default label overlaps with part of the background image to the point of obscuring the text 1 Click Select Tool from the Layout Palette and then select the label ...

Страница 65: ...te a locale from the drawing follow the given steps 1 Click right mouse over the locale 2 Select Delete from the context menu or Use the Select Tool to select the locale and press the DEL key if the locale was just drawn it is already selected just press the DEL key Note Even though the label may be moved it will still be linked to the associated locale Deleting the label will result in deleting t...

Страница 66: ...me of a locale from the Locale list in the Properties panel 2 Once you select the Locale its name will be added to the drawing To shade the Locales 1 Select the Properties panel it contains controls for setting the outline color fill color and fill transparency as shown in the figure 2 Slide the Fill Transparency control from left to right to adjust the shading from transparent to opaque Note Each...

Страница 67: ...ced in the spots on the layout that correspond to their actual locale in the building Otherwise the device detail and Access Point association data received from the Nortel WLAN Location Engine will not be depicted in the correct locale on the Layout The RF Fingerprint and Sensor tools are used in the same way as follows 1 Click Tool in the Palette 2 Move the cursor to the spot on the layout where...

Страница 68: ... layout s scale Any Access Point coverage views that you choose to display on the layout are rendered accu rately using the data received from the Nortel WLE2340 To use the Scale Tool 1 Measure the length or width of any physical location in the building monitored The larger the actual distance measured the better For example measure a room like a Cafeteria Lobby or a large area filled with open o...

Страница 69: ...vas the layout tab or the layout name in the Connections Select File Save from the menu bar Viewing Live Network Activity on the Dashboard layout In order to create views establish a connection to a Nortel WLE2340 as described in Chapter 2 and created one or more Layouts as described in Creating Layouts chapter A view is a real time display of network activity displayed on a Layout This version of...

Страница 70: ...ou invoked the wizard by selecting the on the menu bar then you need to specify the Connection and the Layout These are already filled in for you and grayed out if you invoked the wizard by highlighting the Layout name in the Connections panel 3 Enter an optional Description 4 Click Next to advance to step 3 Select View Components Device view A live view of the distribution of devices across the l...

Страница 71: ... Access Point to which they are connected To configure a Device view use the controls on the View Layers panel shown here Note The Device View checkbox is not used to configure the View but to toggle the Connection data Enter on off when monitoring a live Device View Note If the View Controls panel does not appear to the right of the View select View Controls from the Window menu Additionally the ...

Страница 72: ...Hoc or Access Point Groups Just the devices in the specified group Networks Just the devices on the specified networks 4 Choose either to display the device on the basis of the device is or is not part of the selected criteria 5 Choose one or more values for the selected criteria Use the Any radio button to show devices that meet any of the rules and the All radio button to display only devices me...

Страница 73: ...Devices dropdown The Add Objects to Display dialog appears Select Networks from the dropdown and make sure the is selected Choose the is not to highlight everything except the chosen network 2 Select the desired network use the shift key to multi select and click OK 3 The device you select will be emphasized and dashboard will fade rest of the devices ...

Страница 74: ...ces in Locale from the context menu Saving changes to the View tab When you make changes to view an asterisk appears in the tab It indicates that the layout needs to be saved Edits made to a layout can be saved in three ways 1 Right mouse click on the view name in the Connections panel or on the tab and then select Save 2 CTRL S on the layout canvas the layout tab or the layout name in the Server ...

Страница 75: ......

Страница 76: ...re believed to be accurate and reliable but are presented without express or implied warranty Users must take full responsibility for their applications of any products specified in this document The information in this document is proprietary to Nortel Net works Nortel Nortel Networks the Nortel logo and the Globemark are trademarks of Nortel Networks Microsoft MS MS DOS Windows and Windows NT ar...

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