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XGrabServer, XUngrabServer
- grab the server 
- int XGrabServer(Display *display);  
- int XUngrabServer(Display
*display); 
Specifies the connection to the X server. 
The
XGrabServer   function disables processing of requests and close downs
on all other  connections than the one this request arrived on. You should
not grab the X server any more than is absolutely necessary. 
The XUngrabServer
  function restarts processing of requests and close downs on other connections.
You should avoid grabbing the X server as much as possible. 
XGrabButton(3X11)
,
XGrabKey(3X11)
, XGrabKeyboard(3X11)
, XGrabPointer(3X11)
 
Xlib - C Language X Interface 
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