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XtBuildEventMask - retrieve a widget's
event mask 
EventMask XtBuildEventMask(w) 
      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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