Functions:

    o  mrd_move_medium(3mrd)

    o  mrd_read_element_status(3mrd)

    o  mrd_startup(3mrd)

    o  mrd_position_to_element(3mrd)

    o  mrd_initialize_element(3mrd)

    o  mrd_ready(3mrd)

    o  mrd_prevent_allow(3mrd)