Int 69 Fn 4001  - 10net V5.0 - Syssvc.com - ???                            [N]

   AX = 4001h

Return: CF clear
   AX = 0000h
   ES:SI -> ???

Note:  INT 69 is the default, and may be set to any interrupt from 60h-7Fh;
     the signature "SYSV" immediately before the interrupt handler serves
     as the installation check

See Also: AX=4002h
Index: installation check;10NET SYSSVC