How does cointalk ID a robot?

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I like the websites that say - lets make sure you are not a robot. Enter the code you see on the screen - then they put this little bitty picture where you can't tell i's from l's or 0's from O's. I forget where it was I just had this happen - I think I had to go to the page 3 times before it gave me something I could read and get to work.

 

About as bad are those that show you nine mini-pictures and ask you to click on all images that have trees (or mountains, etc.). Sounds like a very easy job but can be tricky.