The main menu has 

  1) a title line
  2) an area for text in which a selection list is built
     Usually, this displays the name of the current data object.
  3) a set of menu items
  4) a button for clearing the current commandline 
     (displayed at the bottom of the window)
  5) a button for passing the commandline to the shell
     Results are displayed in the xterm window which initiated xmenu.
  6) the current commandline

Items are selected from the main menu with the mouse and the
left button. Note that some items simply change the menu (e.g., 
Output}. (Right now, debug output is echoed to the xterm as well.)

Other items act on the current selection line. The selection line can be
altered by

  1) putting the mouse in the selection region of the menu at a
time when it shows the current object and typing with normal editing
commands (Delete, left/right arrow, ^a,^e,...)
  2) using the``Select object from dictionary'' or  ``Restrict
variables'' menu options.
