get session data by cookies CraftSessionId Is there a service method I can use to get (any kind of) session data by giving the cookies CraftSessionId as a parameter?

if would look something like this. 
craft()-&gt;userSession-&gt;getSessionBySessionId($craftSessionId)
I don't think I'd use PHP's session for this at all, but recently posted some thoughts on a similar question here https://craftcms.stackexchange.com/a/14188/57 about using custom tokens or authorization headers to perform the authorization.