As I am about to start using Selenium on a large scale - this tutorial may come in handy:

Using Selenium RC With Multiple Users

So you may be testing with selenium already, you may even be using selenium RC to automate your testing and integrate it with your other unit tests, and you may already be doing so in a shared development environment, but if you aren’t using selenium RC with multiple users, you may not know that you can start the RC server on any port you wish, allowing multiple clients to connect at the same time.

[From Using Selenium RC With Multiple Users]

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