We use a protocol similar to the one used in eq2 I believe though it really isn't documented anywhere outside of the code. It's kind of difficult to put together via the code because of the layers of abstraction on abstraction. It would just be a matter of decoding the packets further to get them to load from something like WireShark.
Usually the opcodes change from exe version to version though some don't; sony does seem to like to change a lot of the ingame ones every patch; probably to hinder stuff like showeq.
Usually if the client sends a packet and expects a direct response packet for it they will use the same opcode; example would be pickpocket or click object.
It's a shame nothing ever came of openeq and we still have to deal with this. =/
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