Anyone can help me out?

I have a WP and I want to use Zenphoto as my blog gallery. My idea is once my users log in my WP, they will automatically log in ZP; and the way around. I also think it will be really nice if they can log out on both program at one time.

Is that possible? And I prefer not to change WP code or Zenphoto code.

There is an older script for this on the extension section you might want to try or adapt.