Do you mean that each user group has a dedicated content folder ? And they must be redirected to the matching content node after login?
If this is the case, you should be happy with this : http://ez.no/doc/ez_publish/technical_manual/4_0/features/advanced_redirection_after_login
Globally it says that you can confiture redirection after login at a user lever or group level.
Hope this helps !!
Regards
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