InitGraph procedure

  DECLARATION:  InitGraph(var GraphDriver : Integer;
                            var GraphMode : Integer;
                               DriverPath : String);

      PURPOSE:  Initializes the graphics system and places the hardware
                into graphic mode.

         UNIT:  Graph

      REMARKS:  The GraphDriver, can be auto-detected by substituting the
                Detect(0) function for the graph driver number.  If you do
                this, be sure you supply a valid GraphMode parameter for the
                the driver requested.

                DriverPath specifies the directory path where the graphics
                driver can be found. A null indicates the current directory.

                NOTE:  Errors are returned through GraphResult.

 RESTRICTIONS:  Must first be in graphics mode.