SCR_ERASE

       To erase portions of the terminal screen.

       scr_erase [, cmd]

       cmd  --  An integer telling the procedure what part of the screen to
                erase.  If not specified, it is set to 5.  Key:
                        0 : From cursor to end-of-line.
                        1 : From beginning-of-line to cursor.
                        2 : Entire line containing cursor.
                        3 : From cursor to end-of-screen.
                        4 : from beginning-of-screen to cursor.
                     ELSE : Entire screen.

       None.

       None.

       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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