usevent (USHORT)

      The type of event which has occurred.

      CONTROL_SELECTED

        A control was selected.
      HELP_REQUESTED
        Help was requested.
      OPEN_COVERPAGE
        The coverpage is displayed.
      OPEN_PAGE
        The child window of the coverpage is opened.
      SWAP_PAGE
        The child window of the coverpage is swapped.
      OPEN_INDEX
        The index window is displayed.
      OPEN_TOC
        The table of contents window is displayed.
      OPEN_HISTORY
        The history window is displayed.
      OPEN_LIBRARY
        The new library is opened.
      OPEN_SEARCH_HIT_LIST
        The search list displayed.

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