Authentication across projects

Hi all .
I have two projects (A and B), different django installation, database, but same host.

I want the B projects share A project User database table. 
So A user account can login into B project site, but we don't create any user account in B project.
and I have already search many information about that.

1. REMOTE_USER
2. django multi database table
3. remote authentication

but I don't know what is the typical solution ?

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