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http://www.pokerstars.com/prohibited_programs.html

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Now for the $100 question. How are they going to know?

They're own FAQ seems to be contradictory. In one statement, they say you can use anything that sits passively on your machine and uses data from your play.

Then a few statements later, they specifically prohibit certain apps.

Sounds very subjective and open to case-by-case interpretation.