Totally agree with the first part. But, does a program can use more than 4GB of RAM if it's compiled in 32-bit and executed into a 64-bit environnement (with m

Totally agree with the first part. But, does a program can use more than 4GB of RAM if it's compiled in 32-bit and executed into a 64-bit environnement (with more than 4GB of memory)? I imagine that the answer is between yes and no. I imagine that you, as developer, can choose between limiting your program not to use more than 4GB or let the system (host) do the memory re-mapping job for you... But what about reliability in this case?