INT 2F U - PCIBM PC LAN PROGRAM REDIR/REDIRIFS internal - ???
AX = 0203h
Return: nothing???
Notes: this function is called by the DOS 3.3+ PRINT.COM
AX=0204h appears to be the opposite function
these functions are supposedly used to signal opening and closing of
printers
SeeAlso: AX=0200h,AX=0204h