Verifies whether a specified event is valid
for a specified widget. For each type of widget, only certain events
are valid. The function returns a value (TRUE/FALSE).
Note: Does not apply to SpeedScript programming.
Syntax
VALID-EVENT ( handle , event-name[ , platform] )
handle
An expression that produces a value of type HANDLE. The value
must be the handle of a valid widget.
event-name
A character-string expression that evaluates to the name
of an event.
platform
A character-string expression that evaluates to the name
of a platform type: GUI or TTY.
