Each option in a menu is either a token, a placeholder, or a  string.
  If  you  select  a token or placeholder, the expansion of that option
  appears in the buffer.  If you choose a string the string appears  in
  the  buffer.   The menu is removed from the screen after you select a
  menu option.

  When a menu first appears on the screen, you can:

       1.  Move  through  the  menu by pressing the up or down arrow
           keys.  (This causes the indicator to move from one option
           to the next.)

       2.  Select an option from the menu by pressing the EXPAND key
           (CTRL/E),  the  ENTER  key,  or the RETURN key, while the
           indicator is on the desired option.

       3.  Press the PF2 or HELP key to get additional help.

       4.  Press  the space bar to cause the menu to disappear (this
           has  no  effect on the user's buffer). Pressing any other
           key  also  makes  the  menu disappear, however, the key's
           function is performed.