Some of them are just smart enough to press the enter button (and thus they don't move for the whole battle), some are slightly smarter and just follow a team member around (so you don't notice that they are a bot so soon), but some seem to be real players casting spells and such. I had one in my team a few nights ago. She was a real clever bot. She did cast atunements and spells at regular intervals, and - using tab-space - did run in to fight the enemy. It was only after a couple of wins that (when we began getting annoyed at her mindlessly walking through the lava river and barging in without any regard for the team) that we noticed something odd was going on. We did have enough wins to take her into the Team Arena (she was actually good enough to help us in battle) but when we lost one there, she was stuck. We had a little laugh about her there, took plenty of screenshots for a report to Anet, and left her there for her owner to find her in the morning.
The report I send in did not seem to have any effect, however, as a couple of nights later, she was still farming the Comp. Anrena.
I do hope Anet will do their best to keep bots, farming bots as well as advertising bots, out of the game.
