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