INT 13 U - QUICKCACHE II v4.20 - SECTOR LOCKING                                 
	AH = 34h
	AL = function
	    00h end sector locking/unlocking
	    01h lock all accessed sectors into cache
	    02h unlock all accessed sectors and discard from cache
Return: AX = status (0000h successful)
SeeAlso: AH=20h"QUICKCACHE",AH=35h