two domains question

Giganews Newsgroups
Subject: two domains question
Posted by:  troy (troy@nospam)
Date: Mon, 27 Mar 2006

What do I need to do in order to be able to choose which domain I want to
log into?  I've seen this before, where you can choose from a drop down
menu.  I tried joining another domain, but it removed the current one from
my machine.