jagex have a code for everything (iteams,movement eg) so everytime you click its traced, just like how they can prove if you took somthing away in a trade. they are able to catch almost all bots by tracking all actions to the server, the code would probibly look a little like: move.(50032,54902) or something like that, then commands like chop.tree1 (terms in a visual basic form) and they look to see if there is any alteration in the pattern, if one player does the exact same thing for hours, the program sends in a report. Thats just an example ^