Unlink Command (Net Bios, 70h)

        This command is used to cancel diskless boot redirection.
        Typically, a diskless boot ROM makes a connection with a process
        that supplies a virtual floppy image and redirects INT 13
        requests for drive A to this network device. This command
        cancels that redirection so that the local drive A may be
        accessed. Once this command is issued, there is no way to re-
        establish the diskless boot connection.
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