It just depends on the game. Some games store almost all information server side. These games are impossible to write decent hacks for. Other games store info client side. These are the games that people can hack: wall hacks, ammo, health ect. a lot of the MMORPG game hacks are bots whether it be grinding bots or attack ect. If you want to get into hacking MMORPG you need to learn how to identify which addresses you are allowed to modify. If it's read only, then you can't touch it. learn to use a memory scanner (Cheat engine, MHS). Also learn some asm. this is vital for creating a good MMORPG hack.
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