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SelectWindow()
Select or determine the current window
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Syntax
SelectWindow( [ <hWnd> ] )   -->   hOldWnd

Arguments
<hWnd> is the handle of the new window.  If this parameter is
NIL the current window stays selected.

Returns
The handle of the old (or current) window is returned as a non-
zero integer.  If there is/was no current window, zero (0) is
returned.

Description
This function provides a way for an application to determine
the current window handle, and/or to change the selected
window.

Example
if  SelectWindow() == 0
     // no current window
     quit
endif