Is there a command or method (other than RTFM) to determine if a system has a UEFI BIOS?

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http://unix.stackexchange.com – My inspiration for asking this is this other question on Ask Ubuntu. One reason I am asking is that I am just curious. I would like to know more about this for whatever value it might have in the future. But I would also like to know so that I have a procedure I can ask a user to perform when I am wondering WTF might be up with them and their system. ;-) Initially I wondered if this information might be detected and reported by a tool such as (or similar to) dmidecode. But what would happen when a UEFI BIOS is simulating a pre-UEFI BIOS? I expect this question will only become more intere (HowTos)