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Multiple Apps Sharing DB

If I have multiple sites here at PA, is there a way to make them partially share the MySQL database of the first?

The ultimate goal for this is for me to make a second site, but it would be real cool if that site could share the authentication tables with the first one. Ie, same users and logins and stuff. Is this possible to share databases like this while other functionality in the second site has its own database? If not, is there another good way to share logins across two or more sites?

To clarify, I'm talking about Django sites. I realize I didn't specify.

I'm pretty sure you can't do that by sharing parts of the database between different Django instances, but I could be wrong on that one. I'm pretty sure there must be a module that would do it in some other way, though. Have a google around for django single sign on or django federated login.

Okay those are good starting points for some research. Thanks for the pointers.