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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);  
- app_context
- Specifies
the application context. 
- dpy_return
- Returns a list of open X display connections
in the specified application context. 
- num_dpy_return
- 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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