XF 1.2 Memcache - Name of Session Key?

[Bill.D]

Hey all,

Does anyone know what Xenforo uses for the key name that holds the Session value in memcache? And then to continue along that, how would you then get the user ID?

For the more technical aspect, here is what I am trying to do:

Use:

$_COOKIE['xf_session']

To get the session ID and then,

$memcache_obj->get("xf_user_id");

based off of the session ID.

Thanks,
-Bill