INT 2F - NETWORK REDIRECTOR - INSTALLATION CHECK
AX = 1100h
Return: AL = 00h  not installed, OK to install
01h  not installed, not OK to install
FFh  installed
Notes:  called by DOS 3.1+ kernel
In DOS 4.x only, the 11xx calls are all in IFSFUNC.EXE, not in the
PC LAN Program redirector; DOS 5.0 moves the calls back into the
redirector


2F1100 - NETWORK REDIRECTOR - INSTALLATION CHECK