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FONT_OPEN()
   Reads the font from disk and prepares it for use.

   Syntax
         nFontHandle = FONT_OPEN(cFileName)

   Arguments
         cFileName   Sets the file to open. Any legal DOS path and file
                     name.

   Returns
         nFontHandle Returns the number for the font.

   Description
         FONT_OPEN() reads the font from disk and prepares it for use. After
         the font is loaded into memory, the font file is closed. If
         successful, the function returns a font handle which is used by
         other functions to specify the font. A 0 is returned if an
         error occurs. (The first font handle loaded from disk begins with
         font handle 4, the first 2 are the internal machine fonts.)

         The 8x8 ROM BIOS font is already opened with a predefined handle
         of 1. If an EGA card is installed, the 8x14 font is also available
         as font handle 2, and likewise, if a VGA card is present, the 8x16
         font is also available as font handle 3.

         The font files have extensions of .@ and .#. Each file is named
         according to the type of font contained in the file. The .@
         extensions are the bitmapped fonts, and the files with extension .#
         are the stroke fonts.