We are currently deploying a system for language schools to gather learning material and assets for their students. We had used Umbraco for a website earlier and it became our obvious choice when we started this system.

We handle several schools under one installation and set sub domains to add further schools, which all gets a root node in the cms accessible only to themselves. This setup works quite flawlessly so far and the front-end, for those that are interested, can be seen at www.sociallearningsystem.com.

One feature we want to add is to have the school administrators accept the terms and conditions the first time they log in. We could easily add a true/false field to the users, but we are stuck as to how we create a page in between login and the cms (and only when they haven't accepted previously). 

Any ideas of the best way to solve this?

Many thanks.