User`s guide

Detecting Pendant Button Presses
Individual pendant button presses are detected with the PENDANT() real-valued function.
(The figure T1/T2 Pendant Button Map provides a reference for the numbers of the buttons
on the T1/T2 pendant.) This function returns the number of the first acceptable button press.
The interpretation of a button press is determined by previous execution of the KEYMODE
instruction. See the V+ Language Reference Guide for complete details. The basic use of
these two operations is described below.
Detecting User Input
V+Language User's Guide, v17.0
Page 288