I have a requirement for two Sitefinity websites that they share the same membership users so whenever someone registers on either of the two websites he should be able to use the same account on the other website. Also, when the user is logged in on one of the two websites and he navigates to the second website he should also be logged in to the second. This functionality is somehow close to logging in to the different services on Google.
What are the tips and tricks that you suggest to achieve this requirement. Should the two websites share the same database (although i don't think it's possible) or should I implement WCF based authentication on one of the two or should I implement some kind of syndication between the two databases etc.
Appreciate it in advance.