You didn't specify what browsers you want to support. To do it "real-time", you can either poll the server or use Comet or WebSocket (for browsers that support it) or Flash net Socket. As with any collaborative app, I think the hardest problem is conflict resolution/keeping all sessions synchronized.
You might be interested in reading Google Wave Protocol too. It's a white paper on real-time collaborative document editing. Not for the faint of heart :D
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您没有指定要支持哪些浏览器。要“实时”执行此操作，您可以轮询服务器或使用 Comet 或 WebSocket（对于支持它的浏览器）或 Flash net Socket。与任何协作应用程序一样，我认为最难的问题是解决冲突/保持所有会话同步。
您可能也有兴趣阅读Google Wave Protocol。这是一份关于实时协作文档编辑的白皮书。不适合胆小的人:D
You didn't specify what browsers you want to support. To do it "real-time", you can either poll the server or use Comet or WebSocket (for browsers that support it) or Flash net Socket. As with any collaborative app, I think the hardest problem is conflict resolution/keeping all sessions synchronized.
You might be interested in reading Google Wave Protocol too. It's a white paper on real-time collaborative document editing. Not for the faint of heart :D