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VW_FLOPEN()
   Opens a disk file to hold video data underlying the viewports.

   Syntax
         VW_FLOPEN(cFileName)

   Arguments
         cFileName   Sets the DOS file name.

   Returns
         VW_FLOPEN() returns a 1 if the file is opened successfully, otherwise
         a 0 is returned and an error will be recorded.

   Description
         VW_FLOPEN() opens a disk file to hold video data underlying viewports
         when they are opened or moved about on the screen. This is important
         if you are using large viewports or working in an EGA or VGA graphics
         mode.

         After executing this function, all viewports opened (with the
         requirement that the underlying data be preserved) will save the
         necessary data to the designated file.

         If the file is opened successfully, then a 1 is returned, otherwise
         0 is returned and an error will be recorded.