Use menus to do editing operations with the mouse, instead of
  typing commands or pressing defined keys.

  To use a pull-down menu, do the following:

      1.  Point to the name of a menu in the menu bar.
          Press MB1 to display the menu.

      2.  Drag the mouse to the item you want, and then press MB1.

  To use a pop-up menu, do the following:

      1.  Within a buffer's borders, press and press MB3 to
          display the pop-up menu.

      2.  Drag the mouse to the item you want, and then press MB3.

  o  LSE provides different pop-up menus for user buffers
     and review buffers.

     The user buffer pop-up menu contains menu items to
     cut, copy, or paste text; search for text strings; and save
     or close buffers.

     The review buffer pop-up menu contains menu items to move between source
     code and errors, and to end reviews.

  o  If you choose a menu item that requires additional information, a
     dialog box appears where you can type the information, such as a file
     specification or search string.

  o  Some menu items have a dialog box where you can choose settings or
     preferences, for example, Window Attributes ... in the Options menu.

  o  The status line is also a kind of menu.  Clicking  MB1 on the buffer
     name puts your next buffer in  the window for that status line (the same
     as the NEXT BUFFER command); clicking MB1 on one of the other
     fields of the status line toggles that setting  (for example, to
     change from insert to overstrike mode).