SELECT_W

       Create a non-exclusive widget menu of items

       More than one item may be selected or 'de-selected'.
       Normally called by SCREEN_SELECT

       SELECT_W, items ,iselected, [ comments, command_line, only_one ]

       items - string array giving list of items that can be
               selected.

       comments - comments which can be requested for each item in
               array selections.    NOT YET IMPLEMENTED
       command_line - optional command line to be placed at the bottom
               of the screen.  It is usually used to specify what the
               user is selecting.
       only_one - integer flag. If set to 1 then the user can only select
               one item.  The routine returns immediately after the first
               selection is made.

       SELECTIN - vector of items to be pre-selected upon input (not used for
               only_one option)

       iselected - list of indices in selections giving the selected
               items.

       COUNT  - Integer scalar giving the number of items selected

       SELECT_W - Used to communicate with the SELECT_W_EVENT procedure

       Written, K. Venkatakrishna & W. Landsman, Hughes/STX    January, 1992
       Widgets made MODAL.  M. Greason, Hughes STX, 15 July 1992.
       Changed handling of MODAL keyword for V5.0   W.Thompson  September 1997
       Converted to IDL V5.0   W. Landsman   September 1997
       Added selectin keyword  D. Lindler 01/12/99

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