Ok Charlie
separated by a router
is what I wanted to know.
I personally think SME Server Local Networks page is unclear and ought to say "You will need a router to the other network".
It could easily be assumed by newcomers that SME will act as the router to route to the other network WITHOUT a secondary IP router.
I know you guys are au fait with IP networking but the whole premise of SME Server is that you don't need an IT specialist to set it up. Clearly, if using additional Local Networks, you do. I undertand the basics of IP Networking but the ambiguity or lack of clear explanation on the page lead to the question.