Any tips on how to starts a multiplayer game on the internet?

I've always wanted to make an online horse game, but don't know how. Can I download a software for it or something? Please help! I already pretty much know HTML and stuff, so does anyone have any tips on how to get started?Any tips on how to starts a multiplayer game on the internet?Yes, I know a software is very good for you. You can download it and try to use it. http://www.desktopgather.com/Any tips on how to starts a multiplayer game on the internet?try this sites (i've used it): http://actio0928.notlong.com/9AAmDK1