BLINK

       To allow the user to alternatively examine two or more windows within
       a single window.

       BLINK, Wndw [, T]

       Wndw  A vector containing the indices of the windows to blink.
       T     The time to wait, in seconds, between blinks.  This is optional
             and set to 1 if not present.

       None.

       The images contained in the windows given are written to a pixmap.
       The contents of the the windows are copied to a display window, in
       order, until a key is struck.

       Blink windows 0 and 2 with a wait time of 3 seconds
       IDL> blink, [0,2], 3

       Written by Michael R. Greason, STX, 2 May 1990.
       Allow different size windows   Wayne Landsman    August, 1991
       Converted to IDL V5.0   W. Landsman   September 1997

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