Function 440Ah          Is File or Device Remote                     DOS 3.1+

    Determines whether the specified handle refers to a file or a
    device that is local (on the computer running the program) or
    remote (on a network server).

        Entry   AX = 440Ah
                BX = Handle of file or device

        Return  DX bit 15   0 = local, 1 = remote
                or
                AX = Error code, if CF is set
                     | 01h Invalid function
                     | 06h Invalid handle

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    Other bits in DX contain additional information about the file or
    device. In particular, bit 7 of DX specifies whether the handle
    identifies a file or a device.

                DX for disk file (bit 7 = 0)
                Bit     Description
                0-5     Drive number (0 = A, 1 = B, etc.)
                6       1 = File has not been written to
                7       0 = Disk file
                12      1 = No inherit
                14      1 = Date/time not set at close
                15      1 = Remote file, 0 = local file


                DX for device (Bit 7 = 1)
                Bit     Description
                0       1 = Console input device
                1       1 = Console output device
                2       1 = Null device
                3       1 = Clock device
                4       1 = Special device
                5       1 = Binary mode, 0 = ASCII mode
                6       0 = EOF returned if device is read
                7       0 = Device
                11      1 = Network spooler
                12      1 = No inherit
                13      1 = Named pipe
                15      1 = Remote device, 0 = local device

                All other bits are zero.