How can I be certain that the computer I'm using can run a 64-bit OS?

How can I be certain that the computer I'm using can run a 64-bit OS? Specs aside (from a website or other source). What can I do to to be certain my laptop can run a 64-bit OS (ie. Windows 7 64bit)
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Guest [Entry]

"You can run a 64-bit OS definitely if your processor supports AMD64/EMT64.

IA64 is a holdover 64-bit architecture from the Intel Itanium class of processors - designed for servers. It is somewhat considered outmoded now."