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07-01-2008   #23 (permalink)
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Originally Posted by Zamte
UDP packets are not ordered. This is a problem in most MMO games. We don't want the game to be recieving packets out of order because this could easily cause some basic duping issues, as well as other similiar problems.
Similar problems may very well happen with TCP if status of the item changes after packet loss and TCP starts resending old information. Lack of packet ordering isn't a problem in some cases, like character movement

Originally Posted by Zamte
Chat programs and IM programs I imagine could use UDP much easier because there is a set data packet or set of packets for each message, and the program itself isn't trying to do anything in real time.
No, you use TCP for chat programs so that messages actually arrive their destination