/sys$common/syshlp/BKM$HELP.HLB  —  List box
    Choosing an item from a list box

    To choose an item, highlight the item and press Return.  To close the
    list box without choosing and item, press Ctrl/Z.

    When you choose an item, the item will automatically fill in the
    field to which the item refers.  If you are choosing a help topic
    item, information about the topic you choose is displayed when you
    press Return.
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