VMS Help  —  MRD Library, mrd_map_element, Return Values
    Upon successful completion, the mrd_map_element(3mrd) function
    returns the element type, which is one of SLOT, PORT, DRIVE or
    TRANSPORT. On an error it returns zero (0). The two possible
    errors are the robot_info address being NULL and the address not
    one used by this medium-changer.
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