INT 21 O - Novell NetWare - COPY FILE TO FILE (FCB)
        AH = E6h
        CX:DX = number of bytes to copy
        DS:SI -> opened source FCB
        ES:DI -> opened destination FCB
Return: AL = error code
        CX = ???
        DX = ???
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

.