Hi GStoneJHA,
1. In your case, I think you will need to integration with your own membership system.
2. What I mean integration must finish all steps at http://www.cutesoft.net/live-support/Developer-Guide/scr/DeploymentIntegration.htm
3. After the steps above, you can login the operator as administrator, then right click on the department name to add an agent into the department.
4. The CuteLiveSupport will use the chat provider method below to find the user which you fill. If has this user, add into the department, if not, return fail(can't find).
public override string FindUserLoginName(string nickName)
5. In your chat provider, you alwoay return "testuser1". So at point 3 above, can not add any agnet into the department.
Regards,
Ken