INT 2F U - IFSFUNC.EXE (DOS 4.x only) - GENERIC IOCTL???
AX = 112Bh
SS = DOS DS
CX = function/category
DS:DX -> parameter block
STACK: WORD value of AX on entry to INT 21 (440Ch or 440Dh)
???
Return: CF set on error
AX = DOS error code (see INT 21/AH=59h)
CF clear if successful
Note:   called by DOS 4.0 kernel


2F112B - IFSFUNC.EXE (DOS 4.x only) - GENERIC IOCTL???