Exactly this , you edit a package by altering a value...Lets use gold for instance...
If you have 60k and search that value in cheat engine, you'l end up with thousands of packets to edit ...drop 1 gold , searh 59,999k and so on until you shorten the list of packets.
Once you found that packet you can edit it! Now , most server sided games are untouchable with this method (unless your dungeon defenders and feel the need to be complete idiots).
As koriban said, completely graphical.
It's a good idea to tell people the name of the level 1 speedhack for mir although it doesn't work here it isn't allowed to name the name of such a programm in here
Same for you kori, forums mods don't really like it.
