SCR_SCROLL

       Define the scrolling area on the screen.

       Please note that the line coordinates should be counted from 1.

       scr_scroll [, top, bot]

       top  --  The line to be the top of the scrolling area.
                The default value is 1 and the maximum value is 23.
       bot  --  The line to be the bottom of the scrolling area.
                The default value is 24 and the minimum value is 2.

       None.

       NOTE:  The screen coordinate system is NOT effected.  (1,1) is not
              the top of the scrolling area but the top of the screen.

       This procedure will only work with DEC compatible equipment (or
       terminal emulators).

       A string containing the appropriate DEC terminal command is put
       together and printed.  NOTE:  In general, the DEC commands correspond
       to the ANSI escape sequences.

       Written by Michael R. Greason, STX, May 1990.
       Converted to IDL V5.0   W. Landsman   September 1997

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