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Depends on your OS.

For Linux the simplests way is to set LD_LIBRARY_PATH.
For example
export LD_LIBRARY_PATH=/lib32:/usr/lib32

Once you have all required 32-bit libraries you can run 32-bits executable on 64-bit OS.
Well-know example is skype.

Yes. -m32.
But let linker know a location of 32-bits libraries (you even might not have them installed yet).