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... Bouth are independent websites but sharing some tables. One of the shared tables is the Users-table. Another one is the easysocial-table. Now I created the single-login on website2. I turned the single-login on, filled the domain "website1.com" and the secret-word taken from the website1 ...

... different but I believe Multi Sites has done this before so here goes... We'd like multiple instances of the primary website installed on already created sub domains (created through cPanel). Each sub domain should be able to use the same template as the primary site but allow colour and logo ...

We will check, thanks for a ticket created - we will reply there.

Yes, exactly, MightySites allows to run multiple Joomla websites from single installation of Joomla on master site.

Slave sites are created as parked domains in hosting panel - so they use same files.
But each site can use own database tables and hence have own contents.

Sorry, what do you want to know?

... of master site, so all 3 sites will always have same all users. Any user-related action on any site will affect all sites (no matter where user is created/registered/updated/deleted - all sites have same users). If PayPlans uses native Joomla database layer for all database queries - it will work. ...

"It's not a problem for newly created slave sites."

You mean that we can somehow merge the new users of the new save sites into the Master ?

Thsnk you

... master site if you want to keep. Thought note that users IDs will be changed and all users relations will be broken. It's not a problem for newly created slave sites.

All sites will use same database tables for users (from database of master site), so no matter where user is registered/created/updated - these changes affect all sites.
Initially all sites will have current users of master site.