Specifies the application-specific data to be passed to the action hook.
adds the specified procedure to the front of a list maintained in the
application context. In the future, when an action routine is about to
be invoked for any widget in this application context, either through
the translation manager or via
the action hohok procedures will be called in reverse order of registration
jut prior to invoking the action routine.
Action hook procedures are removed automatically and the
s destroyed when the application context in which they were added is
removes the specified action hook procedure from the list in which it
X Toolkit Intrinsics - C Language Interface Xlib - C Language X Interface