I have 3 domains that are themed the same. If somebody chooses a different theme, I want it to propagate across all 3 domains so their experience stays the same.
I was planning to accomplish this by setting a cookie on domain1, redirect to domain2 where the cookie is set, redirect to domain3 where the cookie is set, redirect back. Since the information doesn't need to be secure or protected, this will work fine with no real problems.
I hate the idea 3 redirects just to set a cookie on each domain and was looking for something a little more elegant.