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XtAppLock, XtAppUnlock - lock and unlock
application context 
void XtAppLock(app_context) 
      XtAppContext app_context;
 
void XtAppUnlock(app_context) 
      XtAppContext app_context;
 
- app_context
- Specifies the application context. 
XtAppLock
  locks the application context including all its related displays and
widgets.
XtAppUnlock   unlocks the application context. 
X Toolkit Intrinsics - C Language Interface 
Xlib - C Language X Interface 
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