INT 21 O - Novell NetWare - SET FILE ATTRIBUTES (FCB)
        AH = E4h
        CL = file attributes (see below)
        DX:DX -> FCB (see AH=0Fh)
Return: AL = error code
Note:   this function was added in NetWare 4.0, but was removed some time prior
          to Advanced NetWare 2.15, and is no longer listed in current Novell
          documentation
SeeAlso: AX=4301h

Bitfields for file attributes:
 bit 0  read only
 bit 1  hidden
 bit 2  system
 bit 7  shareable

.