dIRC is a program specially designed to connect several IRC chats at the same time. With this tool you can open several accounts in one computer it doesn't matter if you have one already open. It comes with a fully customizable interface, full of detailed features for you to add plug ins such as spell checkers, pop up blockers, auto complete and many others.
Its layout is user friendly and it has an excellent and fast performance. It will take you less than a minute to install it and understand how to use it, there's no configuration needed, all you have to do is to install it and the application will do the rest.