You could put links to the other sites (home page) in the layout.master page of the skin for each site, often people use flag icons for such links. However there is nothing in mojoPortal that will link to the same page in a different site, we make no assumptions that different sites will have the same pages or the same urls. If you need something to do that you could make a custom control and embed it in your layout.master file and your custom control would have to have the logic to determine the urls to link to based on your conventions.

Hope that helps,

Joe