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   I have got a delicate problem with the three routines XtAddInput,
   XtAddTimeOut and XtAddWorkProc. The problem I have is that when
   I use them in my application they seem not to be registred properly.
   I have made a handy little testprogram where everything works
   perfect, but in my "real" application nothing happens. 

The introduction in R3 of the XtApp*() functions obsoleted those
routines (see Q19 for other changes in R3, R4, and R5).  What happens is
they use a default application context different then the one you may
have created.  Since events and timeouts are distributed on a per
application context basis and you are using two application contexts,
you won't get those events.

For example:

	...
	cnt = 0;
	toplevel = XtAppInitialize(&app, class,
				   Desc, XtNumber (Desc),
				   &argc, argv,
				   Fallback, args, cnt);

	XtAddTimeOut (...)
	XtAddWorkProc (...)

	XtAppMainLoop (app)

would never invoke the timeout.