Some of the Dota cheats use methods in which subtle bits of what should be private information are made public, although not always in a nice/easy way for human

Some of the Dota cheats use methods in which subtle bits of what should be private information are made public, although not always in a nice/easy way for humans to see. For example some animations and particle effects are visible through the fog of war. Another interesting situation (which I think was recently fixed?) was a bitmap stored on a unit (for example, your hero) for visibility checks by each faction (as in, which factions could see you). You could thus tell if you were visible, and hence detect enemy vision.