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XtGetDisplays - retrieve a list of displays
associated with an application context 
- void XtGetDisplays(XtAppContext
app_context, Display 
- ***dpy_return, Cardinal* num_dpy_return);  
Specifies
the application context. 
Returns a list of open X display connections in
the specified application context. 
Returns the count of open X display connections
in dpy_return. 
To free the list of displays, use XtFree.   
X Toolkit Intrinsics - C Language Interface 
Xlib - C Language X Interface 
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