HP TeemTalk Terminal Emulator 7.0, User Manual

Page: 175 / 340

IBM 3270 Display Emulation
SysReq Key Support 159
SysReq Key Support
When the
SysReq
option in the
Telnet Options
dialog is selected, the
key mapped with the SysReq function enables you to toggle the dis-
play and keyboard entries between the host operating system and the
application. This enables you to switch to the operating system and
issue a LOGOFF command.
The status line will display the following symbol when communicat-
ing with the operating system:
Note: Not all TN3270E servers provide full support of the SysReq
key.
Network Virtual Terminal Mode
Network Virtual Terminal (NVT) mode allows the operator to com-
municate in ASCII format with a network gateway for routing, logon
etc, before the full IBM terminal emulation protocol is established.
The following symbol is displayed on the status line when in NVT
mode:
NVT mode displays an unformatted screen for data entry, allowing
most of the keyboard functionality for local editing. However, when
the
Enter key is pressed, the line that the cursor is positioned on will
be sent over Telnet as an ASCII string with CR / LF terminators. The
cursor will then be positioned at the start of the next line. ASCII data
received over Telnet will also be displayed at the current cursor
position. A
CR character will be actioned as a 'new line' character,
causing the cursor to move to the start of the next line, scrolling the
display if necessary.