The protocol uses is a proprietary protocol laid over UDP. Packets can be compressed, fragmented, or be many packets in one (don't remember the term).
You shouldn't have to touch this underlying protocol unless you're planning on working on it (could be tough if you don't know how TCP works like the back of your hand, as it's the closest thing to the EQNetwork protocol) as everything is abstracted by the networking code.
You _should_ only have to deal with the higher-level packets, in general.
Read world/client.cpp, zone/client.cpp, and zone/client_process.cpp (I think that's what it's called... haven't touched it in a long time, so I can't remember) for some examples.
Happy Hacking,
Lord Daeken M. BlackBlade
(Cody Brocious)
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