User`s guide

; The status of a button event will be stored in event[0].; Look to see if
that event was a button-up event.
IF event[0] == btn.up THEN
; Check if the button-up event was within the button area
; The x location is in event[1], the y location in event[2]
hit = (event[2] > 99) AND (event[2] < 146)
hit = hit AND (event[3] > 99) AND (event[3] < 146)
END
UNTIL hit
; The code for reacting to a button press is placed here.
This code will work for a single button but will become very unwieldy if several buttons are
used. In the case of several buttons, you should place the button locations in arrays (or a
two-dimensional array) and then pass these locations to a subroutine that checks whether
the mouse event was within the array parameters passed to it.
Creating Buttons
V+Language User's Guide, v17.0
Page 254