Dynapro Technologies Dynapro ET TCS, Application Developer'S Manual

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The host application program can incorporate touch cells into units called touchkeys. A touchkey
can consist of a single touch cell or a group of cells that function as if they were a single touch
cell.
To show the TCS operator exactly where on the screen a touchkey is located, and what function
it performs, touchkeys are usually defined in conjunction with visual targets called touch targets.
Touch targets are usually outlined and labeled. Touchkeys are usually defined to include as many
touch cells as necessary to cover the touch target.
The advantage of using touchkeys that consist of multiple touch cells is they allow for an
enlarged target. This eliminates the difficulty of trying to touch a single touch cell, and greatly
reduces the chance of parallax error.
Touchkeys that contain more than one touch cell are defined with the Build Touchkey command.
Their attributes and reporting reflect that of the upper left touch cell of the group, called the
master cell. When the user presses any touch cell within the touchkey, the TCS uses the
attributes of the master cell to determine what action to take.
Figure 6-2 shows a touch target for a touchkey composed of four touch cells.