What to watch out for when writing 32-bit software on 64-bit machine?

Processors have been 64 bit for some time. I'm perplexed about why people are afraid to make the move to a 64 bit operating system. A 32 bit OS can't address much more than 3Gb of RAM, so that's good enough reason to make the upgrade in my book!

The simplest thing would be to simply build a 32-bit executable. With Visual Studio, just choose Win32 as the build type. With gcc, use the -m32 switch.

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