INT 2F U - DOS 3.3+ internal - SET FASTOPEN ENTRY POINT                         
	AX = 122Ah
	BX = entry point to set (0001h or 0002h)
	DS:SI -> FASTOPEN entry point (see #02611,#02612)
		(entry point not set if SI = FFFFh for DOS 4.0+)
Return: CF set if specified entry point already set
Notes:	entry point in BX is ignored under DOS 3.30
	both entry points set to same handler by DOS 4.01
	DOS 5.0 and 6.0 only set entry point 1


(Table 02611)
Values DOS 3.30+ FASTOPEN entry point is called with:
	AL = 01h  Lookup
	    CX = ??? seems to be offset
	    DI = ??? seems to be offset
	    SI = offset in DOS DS of filename
	AL = 02h  insert file into FASTOPEN cache
	AL = 03h  delete file from FASTOPEN cache
	    SI = offset in DOS DS of filename
	AL = 04h  purge FASTOPEN cache
	    AH = subfunction (00h,01h,02h)
	    ES:DI -> ???
	    CX = ??? (subfunctions 01h and 02h only)
Returns: CF set on error or not installed
Note: function 03h calls function 01h first
SeeAlso: #02612,#02613


(Table 02612)
Values PC-DOS 4.01 FASTOPEN is additionally called with:
	AL = 04h ???
	    AH = 03h
	    ???
	AL = 05h ???
	AL = 0Bh ???
	AL = 0Ch ???
	AL = 0Dh ???
	AL = 0Eh ???
	AL = 0Fh ???
	AL = 10h ???
SeeAlso: #02611,#02613


(Table 02613)
Values MS-DOS 5.0-6.0 FASTOPEN is additionally called with:
	AL = 04h  purge FASTOPEN cache
	    AH = 03h
	    ???
	AL = 05h ???
	    DL = drive (00h = A:)
	    ???
	AL = 06h ???
	    ???
SeeAlso: #02611,#02612