I'm going to go out on a limb here and say wackymacky used an iMac. If it came with an optiarc drive then its quite possible it doesn't have a firmware lock. Most Macs use Matshita drives that cannot be read without the firmware getting flashed.
Umm, yes on a couple of different iMacs, and also a Mac-Pro at work, though the pro has 3rd party drive and professional DVD publishing software.
I havent tried it on my wife Mac-book though I will.