Two different Drupal installations on the same domain using OpenId

I have two different installations on the same server that I plan to use with OpenId.

If my user connects in one site using his openid, will he be asked to login again in the other installation or will the system开发者_如何转开发 find the cookie?

You can share user sessions across Drupal installs.

Here's a D5 tutorial that should be mostly relevant. domain.module may also accomplish what you want.

The Multisite login module might be useful to do that too.