It's a kinda intresting information imo, and new for me. I tried the new Gracia Part II IG walker on L2j. After 7 mins, a GM arrived to tell me: botting is not allowed.
I was wondering how could he catch me so fast... after a lil thinking I got the answer:
When you start botting, the server logs your movements and skill uses. After some minutes the server spawns invisible mobs, that the walker start hitting. Finally the GM get message, that some1 hit the invisible creature...
More intresting: if the walker start hitting the invisible mobs, you cant see the character's casting and mob's name/hp.
With L2NET the result is the same.
Server: