title: Single sign-on with SocialEngine
body: <p>We have an custom site built in PHP, with its own user account profiles/passwords/etc.</p>
  
  <p>Potentially, we will be installing SocialEngine (based on PHP/Zend), but it is contingent on single sign-on capabilities.</p>
  
  <p>Is there a plugin, or does SocialEngine otherwise accommodate allowing users who log into our "main" site to also get logged into SocialEngine?  We are willing to modify the main site to the extent necessary.  </p>
  
  <p>There are a lot of questions around this, but no solid answers yet.</p>
  
  <p>Can anyone provide some insight into how this could be done?</p>