Library /sys$common/syshlp/bkm$help.hlb List box  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    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.