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Just leave it at Xoops Database and you can ignore all the other options in there.
Its just that now functions were added to use LDAP or Microsoft Active directory servers for authentification as an alternate to the normal XOOPS users.
The reason is that in many company you already have a user database in ADS or LDAP and they can use that to logon to XOOPS and donĀ“t have to register yet another account.
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