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 CrtExit                        Issue terminal reset code
 CrtInit                        Issue terminal initialization string
 ClrEol                         Erase from cursor to end of line
 ClrScr                         Clear the screen
 DelLine                        Delete line containing cursor
 GotoXY                         Set cursor col,row corrdinates
 InsLine                        Insert empty line at cursor position
 LowVideo                       Set screen to lo intensity mode
 NormVideo                      Same as HighVideo - Intensity set on
 Window                         Define active screen window coordinates