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I have installed multiple sites on my site using WP 3.0. Is there any way I can share the user database across all these sites so that the user can log into all the sites using the same username and password?
2010-06-19 14:30:00
How about using OpenID? You can use the OpenID wordpress plugin (http://wordpress.org/extend/plugins/openid/) and install OpenID on your own domain, maybe a main network listing site (http://lifehacker.com/5566470/how-to-set-up-openid-on-your-own-domain). I haven't tried it myself but it seems like it might be easier than plaing about with the core of how wordpress works.
2010-06-13 01:56:00
You probably should be looking into Wordpress MU --> http://mu.wordpress.org/ .