Int 21 Fn 12  - DOS 1+ - Find Next Matching File Using Fcb                 [D]

   AH = 12h
   DS:DX -> unopened FCB (see AH=0Fh)

Return: AL = status
       00h successful
       [DTA] = unopened FCB
       FFh no more matching filenames

Note:  (see AH=11h)
   assumes that successful FindFirst executed on search FCB before call

See Also: AH=1Ah,AH=4Fh,INT 2F/AX=111Ch