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XtAppAddBlockHook, XtRemoveBlockHook
- register a block hook procedure 
- XtBlockHookId XtAppAddBlockHook(XtAppContext
app_context, 
- XtBlockHookProc proc, XtPointer client_data);  
- void XtRemoveBlockHook(XtBlockHookId
id);  
Specifies the application context. 
Specifies the block hook
procedure. 
Specifies the application-specific data to be passed to the block
hook. 
XtAppAddBlockHook   registers the specified procedure and
returns an identifier for it. The hook is called at any time in the future
when the Intrinsics are about to block pending some input. 
Block hook procedures
are removed automatically and the XtBlockHookId   is destroyed when the
application context in which they were added is destroyed. 
XtRemoveBlockHook
  removes the specified block hook procedure from the list in which it
was registered. 
X Toolkit Intrinsics - C Language Interface 
Xlib - C Language X Interface 
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