Obtaining parameters to determine group membership during a build

Hi

I'm using teamcity to build a .net project. We have seperate servers we deploy to for each team which we currently have to select as a build parameter to deploy to. I'd like to automate this.

My current idea is assigning users to a team specific group and grabbing that groups name and passing it to the deployment app. However all I can assess via the environment variables is the user name.

How can I access more user details from the environment variables? Or if it comes to it, could I write something to query teamcity during the build?

Thanks

Richard