The basic haven't changed much from ezp 3.x to 4.x, you still set up several site-accesses and configure them to use different parts of the node tree and/or different language and/or different database and/or different design.
Currently they share back end, if you want the two sites to be independent of each other, then make a copy of the back end siteaccess as well (normally something like "*_site_admin").
Then modify each of the siteaccesses for "site2" to use another database(this can be a copy of the one you already use), and another var folder(a copy of the original one if you copy the database).
First of all.... thank you very much for your help. Just one little question: You wrote that the back end shares the sites. That's no problem for me. But how can I change the content of the new site in the back end? I only have the translations which I can change. What did I wrong?
By moving database settings from site wide settings in settings/override/site.ini* to each of your siteaccess specific settings in settings/siteaccess/*/site.ini*
EDIT: Remember to use different var folders for siteaccesses that use different db, this is controlled by another site.ini setting called [FileSettings]VarDir
Notice that if you're using different databases, you won't have to use IndexPage setting due to the fact that each content tree will be in his own database.
You'll also have to make an admin siteaccess for each one.
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