INT 21 - DOS 1+ - FIND NEXT MATCHING FILE USING FCBsee File Control Block
	AH = 12h
	DS:DX -> unopened FCBsee File Control Block (see #01345)
Return: AL = status
	    00h successful
		Disk Transfer Area filled with unopened FCBsee File Control Block
	    FFh no more matching filenames
Note:	(see AH=11h)
	assumes that successful FindFirst executed on search FCBsee File Control Block before call
SeeAlso: AH=1Ah,AH=4Fh,INT 2F/AX=111Ch