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Can anyone direct me in the right way on how to make a clone of AOL IM. I have an internet application I made and I would like to add AIM capabilities to it. I need it to be able to show who is online and be able to make pop-up windows of IM's. I know other programs do this (ie: Odigo). Any suggestions/ideas?
You'll need some sort of central database that has the names of all those logged in. A simple text file on a server should suffice, when a user logs in, your app can append the username to the file, then query it to see who else is online.
You could have things like friends lists, stored locally.