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Function 5E00h          Get Machine Name                             DOS 3.1+

    Returns the network name of the local computer (machine).

        Entry   AX    = 5E00h
                DS:DX = Pointer to a 16-byte memory buffer

        Return  If CH > 0
                   CL = NetBIOS number
                   Machine name copied to buffer (blank-padded ASCIIZ)
                endif
                or
                AX = Error code, if CF is set
                     | 01h Invalid function (Network not running)

    ------------------------------------------------------------------

    This function returns an error value of 01h (invalid function) if
    the network is not running. If the network was never installed, a
    zero is returned in the CH register.