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XtBuildEventMask - retrieve a widget's
event mask 
- EventMask XtBuildEventMask(Widget w);  
- w
- Specifies
the widget. 
The XtBuildEventMask   function returns the event
mask representing the logical OR of all event masks for event handlers
registered on the widget with XtAddEventHandler   and all event translations,
including accelerators, installed on the widget. This is the same event
mask stored into the  XSetWindowAttributes   structure by XtRealizeWidget
  and sent to the server when event handlers and translations are installed
or removed on the realized widget. 
XtAddEventHandler(3Xt)
X Toolkit Intrinsics - C Language Interface 
Xlib - C Language X Interface 
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