I am currently running DokuWiki and SMF as the main part of my site. (I am currently running Gallery2 but it has far more configuration options than I care to mess with) I am also running Joomla in the background with the JFusion plugin to synchronize all of my members' login info.
I would like to have a gallery system which allows my users to upload screenshots of their systems or wallpapers. I would like for my users to be able to log into ZenPhoto using the same information they use for the forum or the wiki without having to register twice.
Is it possible to integrate ZenPhoto's registration system with DokuWiki, Joomla, or SMF?
It is probably possible but you will have to do it yourself. There are no existing solutions to our knowledge (there is a quite old single login script for Wordpress).
Take a look at the lib-auth.php file within the zp-core folder that handles this stuff. Also look at our documentation.
I think I know just enough PHP where I could write a script that pulls the contents of my SMF database (SMF is where everybody registers), check that data against the ZenPhoto database, and synchronizes the two. I could then set up a cron job to run the script every 15 minutes or so...