Int 2F Fn 12FF U - Novell Dos 7 - Script.exe - Get ??? [O]

AX = 12FFh
BX = 0007h
CX = 0000h

Return: CF clear if installed
AX = 0000h
BX = ??? (4426h)
CX = ??? (0068h)
DX = PSP segment of resident code???
SI = ??? (4AFAh)
ES = resident code segment