Can Anyone Do This?!?!

[WAcKeD]

Okay, I have a bit of a problem. I am making a file sharing app, and I need help on getting a retrieveable list of servers for the client to connect to. To get the list, you can use either an SQL Database or a text file on a web site, etc. Anyway, can anyone figure out a way for the server app to tell the clients that the server is running. Say that the person doesn't know the server IP, how would the user find the IP of the server... I had an idea that the server could upload a text file to the web site, then the user could download the list and when the server goes offline, it removes the text file. This is too complicated though. Anyone have any ideas or source for something like this? Preferably, can anyone here make me an ASP or PHP script that can do that? Thanks!

[JoshT]

I had an idea that the server could upload a text file to the web site, then the user could download the list and when the server goes offline, it removes the text file.

To me, this seems like the simplest solution. You'd need a server or a directory to keep track of all the servers.