There are several threads regarding word press login and similar., but I need something much more simple and did not found it, when searching: Parallel to my current vB3 I have few own php applications / functions, which use the user accounts from vBulletin. For this, users have to login within these applications. The login causes a call of a simple user.php and afterwards of a salt.php to verify the login against the vB database. Returned result is just "true" or "false", so the external application accepts the user as logged in or refuses him. If the check was successful, the application opens its own session for the user. My question: is there something similar within XF core to check a login with xf-username/password or is there an addon for this functionality? Thanks for any input!