I hope this isn't a repost......it's very simple, just like using cheat engine to change items ID...
1)Start CE and target WOW
2)Search for your HP
3)Do something to modify your hp and search egain, you should have 2-3 results now
4)Die but don't release
5)Modify the adresses to anything past 0
6)Now release
7)Push log out and then cancel so you can move
Mobs wont hit you, players too but you mana wont regenerate(not sure for rage,runes,energy)
GO in PVP or something
Solo Ulduar bosses.....this is a repost of one of my old threads
Go in ulduar, use emu hacker, save boss locations, go in catapult, teleport, kill boss, i think it works with other bosses deep inside ulduar(teleport there but dont move anything or you will get bugged or ported back, shoot until you see in you chat you are not doing any dmg and then exit catapult and loot)