XtAppAddActionHook(3Xt)

     NAME
          XtAppAddActionHook, XtRemoveActionHook - register an action
          hook procedure

     SYNTAX
          XtActionHookId XtAppAddActionHook(app_context, proc,
          client_data)
                XtAppContext app_context;
                XtActionHookProc proc;
                XtPointer client_data;

          void XtRemoveActionHook(idFP)
                XtActionHookId id;

     ARGUMENTS
          app_context
                    Specifies the application context.

          proc      Specifies the action hook procedure.

          num_args  Specifies the application-specific data to be
                    passed to the action hook.

     DESCRIPTION
          XtAppAddActionHook 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 XtCallActionProc, 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
          XtActionHookId s destroyed when the application context in
          which they were added is destroyed.

          XtRemoveActionHook removes the specified action hook
          procedure from the list in which it was registered.

     SEE ALSO
          X Toolkit Intrinsics - C Language Interface
          Xlib - C Language X Interface