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XtAddInput, XtAddTimeout - register
input, timeout, and workprocs 
- XtInputId XtAddInput(int source, XtPointer
condition, 
- XtInputCallbackProc proc, XtPointer client_data);  
- XtIntervalId
XtAddTimeout(unsigned long interval, XtInputCallbackProc 
- proc, XtPointer
client_data); 
- XtWorkProcId XtAddWorkProc(XtWorkProc proc, XtPointer 
- client_data);
 
- client_data
- Specifies the argument that is to be passed to the
specified procedure when input is available 
- condition
- Specifies the mask
that indicates a read, write, or exception condition or some operating
system dependent condition. 
- proc
- Specifies the procedure that is to be called
when input is available. 
- source
- Specifies the source file descriptor on a
UNIX-based system or other operating system dependent device specification.
XtAddInput   has been replaced by XtAppAddInput.
XtAddTimeout
  has been replaced by XtAppAddTimeout.   
XtAddWorkProc   has been replaced
by XtAppAddWorkProc.   
X Toolkit Intrinsics - C Language Interface 
Xlib - C Language X Interface 
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