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XtToolkitThreadInitialize - initialize
the toolkit for multiple threads 
Boolean XtToolkitThreadInitialize()
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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