How set the system environment flag CUDA_FORCE_PTX_JIT=1

Accelerated Computing CUDA CUDA Programming and Performance
1

Hi, in doc for porting tesla code to fermi,
it says I can set the system environment flag CUDA_FORCE_PTX_JIT=1 to test if my code is ready for fermi.
but where can I set the system environment flag CUDA_FORCE_PTX_JIT=1?

2

In a linux/mac terminal

CUDA_FORCE_PTX_JIT=1 ./my_application

In windows, it is buried somewhere deep in the system control panel.