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XtToolkitThreadInitialize - initialize
the toolkit for multiple threads 
- Boolean XtToolkitThreadInitialize(void);
 
If XtToolkitThreadInitialize   was previously called, it returns.
The application programmer must ensure that two or more threads do not
simultaneously attempt to call XtToolkitThreadInitialize;   the effect
of this is undefined. XtToolkitThreadInitialize   returns True   if the
host operating system has threads and the Intrinsics are thread safe.
X Toolkit Intrinsics - C Language Interface 
Xlib - C Language X Interface 
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