In the simplest case, invoke it as ``menu''. If you are vfsetup to a virtual system and there is a directory named /MENU in that virtual system, it will use that directory. If you have not run the vfsetup command or if there is no link named /MENU in the current virtual system, it will bring up the default menu for your site. We have set up a default menu for people who compile Prospero to use the default site, the ISI guest site.
If you are already vfsetup to a virtual system, you can invoke the menu browser as ``menu linkname''. The browser will display the Prospero directory linkname as its root menu.