INT 69 - 10NET v5.0 - SYSSVC.COM - ???
AX = 4001h
Return: CF clear
AX = 0000h
ES:SI -> ???
InstallCheck: test for the signature "SYSV" immediately before the interrupt
handler
Range: INT 60 to INT 7F, selected by configuration
SeeAlso: AX=4002h
Index: installation check;10NET SYSSVC