Menu Questions

[tomw at videotron.ca]

In a default xfce installation you get 2 pre-configured menus
      The desktop menu  (when you right click on the desktop)
      The Xfce menu (button)
Ok first question can you make changes to desktop menu without changing the Xfce menu?
(They appear to be identical ...)

Second question: if the answer to the first question is yes, then how can I modify the desktop menu
(which files) and build a custom menu? The menu editor does not seem to allow for the elimination of
entries in  /usr/share/applications (System, Multimedia etc)