Well, the client has to send data to the server if the stuff is being done clientside. I'd think of Classic's movement as more secure than other systems just because it's a lot more unique than any other systems.
Being unique is not always a good thing.
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[06:24:19] * Parts: Skyld (i=silent@unaffiliated/skyld) ("Perhaps Okiesmokie did not realise that I like the boys. ")