I've heard Quassel Core is multi user capable? How do I make use of that?

Yes, Quassel Core can handle multiple users, but we don't have an UI for that yet.

You will find a python script, manageusers.py, in the scripts/ directory. This allows you to add new accounts to the core's database and change passwords for existing ones.

Windows?

I don't suppose us Windows users have something like this?

Adding users in the development core

In the git version, which will eventually become the 0.5 release, it is possible to manage core users by way of cli parameters for quasselcore (see quasselcore --help). The script is no longer needed in these recent versions.

Note that this feature won't appear in any 0.4.x release, so if you stick with the stable builds, you'll have to find another way.

figured out a way to use Multiuser in windows

What I did was install the Core on my server. Then install the Client on my computer. Next I went through the setup and got one user setup and configured.
Back on the server I downloaded sqlitestudio which is a free sql database editor. I opened the Quasselirc database which is in \documents and settings\username\Application Data\quassel-irc.org the file is called quassel-storage.sqlite

So I opened that database with my editor, edited the Tables, Quasseluser, and added a new user, using the encrypted password listed for the first account (cut n paste). After that Quassel worked as if I had 2 accounts with different usernames but the same password.

At least for now, I am real happy.