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XtRegisterDrawable - register a drawable
with the Intrisics event dispatcher 
- void XtRegisterDrawable(Display*
display, Drawable drawable, 
- Widget widget);  
- void XtUnregisterDrawable(Display*
display, Drawable drawable);  
Specifies the drawable's display.
Specifies the drawable to register. 
Specifies the widget to register the
drawable for. 
XtRegisterDrawable   associates the specified drawable
with the specified widget so that future calls to XtWindowToWidget   with
the drawable will return the widget. The default event dispatcher will dispatch
future core events that arrive with the drawable to the widget as though
the event contained the widget's window, but the event itself will not be
changed in any way when being passed to even handler or action procedures.
If the drawable is already registered with another widget, or if the drawable
is the window of a widget in the client's widget tree, the results of calling
XtRegisterDrawable   are undefined. 
XtUnregisterDrawable   removes an association
created with XtRegisterDrawable.   If the drawable is the window of a widget
in the client's widget tree the results of calling XtUnregisterDrawable
  are undefined. 
X Toolkit Intrinsics - C Language Interface 
Xlib - C Language X Interface 
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