Integrate several forums to one

Can it be true? Noone has tried this?

i'd imagine having a seperate DB for users and messages etc (if PM mod installed) to the other forums and then altering the PunBB code for each of the forums to then get the user info from this "central" user DB shouldn't be too hard to do. thus each user can log into all of the seperate forums with the same username and password, while each forum has seperate category, topic and post IDs to each other as usual.

Lars,

Is this the correct understanding...
you wish to setup several forums,
and then provide unique rights for viewing each one 
to differnt groups of users
?yes?

If so, then maybe it would work to import and setup your forums,
and then setup unique user group rights to each of them,
and then add your users to the relevant unique user group(s) that provides them access to the forum that that group has rights to view.

This is what I do.... does this make sense?

Hmmm... I am wondering, couldn't you simply combine the tables after installing one forum at a time using the prefixing feature? ....and then simply either use the database manager, or even download the database tables and use a simple editor ...for combining the forum and users and groups tables?

BTW, I would conduct each installation, including the first one, utilizing a prefix.  You will see uniquely identifiable groups of tables in the database, which makes it easy to merge/copy/etc between the tables.  you should be able to easily test this.

Make sense?