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XtAppLock, XtAppUnlock - lock and unlock
application context 
- void XtAppLock(XtAppContext app_context);  
- void
XtAppUnlock(XtAppContext 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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