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XtGetSelectionRequest - retrieve the event
that triggered the XtConvertSelectionProc 
- XSelectionRequestEvent*
XtGetSelectionRequest(Widget w, Atom 
- selection, XtRequestId request_id);
 
Specifies the widget. 
Specifies the selection being processed.
Specifies the requestor id in the case of incremental selections, or NULL
in the case of atomic transfers. 
XtGetSelectionRequest   may
only be called from within an XtConvertSelectionProc   procedure and returns
a pointer to the SelectionRequest   event that caused the conversion procedure
to be invoked. Request_id specifies a unique id for the individual request
in the case that multiple incremental transfers are outstanding. For atomic
transfers, request_id must be specified as NULL. If no SelectionRequest
  event is being processed for the specified widget, selection, and request_id,
XtGetSelectionRequest   returns NULL. 
X Toolkit Intrinsics - C Language Interface 
Xlib - C Language X Interface 
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