Int 7F Fn 4321  - Tiga Communications Driver V2.05 - Installation Check    [V]

   AX = 4321h

Return: AX = 0000h if installed

Note:  INT 7F is the default, but may be overridden

See Also: AH=01h"TIGA",AX=1234h,AX=2525h,AX=4321h,AX=5555h