INT 6B - NPC NCSI EXTENDED SERIAL I/O - VIRTUAL CIRCUIT STATUS AH = 12h AL = virtual circuit number (0-8) Return: CF clear if successful AL = virtual circuit number CL = virtual circuit's state 00h idle 01h Telnet session, in command state 02h Telnet session, connected to host 03h-06h ??? (not returned by TelAPI) CF set on error AL = error code E2h invalid virtual circuit number E4h specified virtual circuit not allocated Note: this function is also supported by TelAPI SeeAlso: AH=10h,AH=15h,AH=1Ah,AH=1Bh,AH=1Fh