Gnome is correct, but there is no Main Menu under "Desktop ->
Preferences". There is a "Menus and Toolbars" selection, however it has
nothing to do with editing menu items. BTW it looks like "Desktop" has
replaced "System".
"Help" talks about creating a "XDG_CONFIG_DIRS/menus/applications.menu"
in $HOME, supposedly to define a menu entry, and while it looks doable,
it also looks like I would be opening a bucket of worms.
I forgot to include the fact that I'm running 2.6.24-etchnhalf.1-486.
Sorry.