> I've seen it done with other programs, too, like C compilers noticing 
> they're compiling SPECmark suites and such.

Even car manufacturers get on this too.  The ECU detects when the car is 
being subject to the standard emissions and economy tests (to provide the 
official figures for fuel consumption and CO2 emmissions) and then 
deliberately runs in some special state to get better results.

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