Easy way to force a 'homepage' on a network?

I have a network where users can come and go at will with their own machine. What I need to do is force them to see an informational page when they first connect with their browser. The only equipment in place is a couple of routers. No servers.

What is the easiest way to force a page, at least once?

 

Using peer to peer Network there is No Log On, you are connected on a Hardware/OS Level.

You need to install a server in order to enforce connection and displaying specific content.

If you are using Wireless there is free software up to three users that can help in such endeavor.

http://www.lucidlink.com/index.asp

 

Thanks for the info Cat5e. The software you mentioned requires a client to be installed on the network machines and so will not work in my situation.