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   NAME
        CBD_CURRENTREADID - Determine the current read identifier.

   FUNCTION
        CBD_CURRENTREADID fills the io_ClipID with a clip identifier that
        can be compared with that of a post command: if greater than
        the post identifier then the post data held privately by an
        application is not valid for its own pasting.

   IO REQUEST
        io_Message      mn_ReplyPort set up
        io_Device       preset by opendevice
        io_Unit         preset by opendevice
        io_Command      CBD_CURRENTREADID

   RESULTS
        io_ClipID       the ClipID of the current write is set