I couldn't find much related to this function, without a third party app, but my main concern is Apple provided utilities, as these would be most prevalent.
hamish225: im pretty sure its just like any windows pc, you format the drive and everythings gone, i could be wrong though.
jnimmo: I just came across a thread online where someone was saying if you reset the PRAM it turns off Find my Mac. If that was true, I guess it would mean if a thief reset the PRAM before you managed to remote lock it then the remote lock would be useless.'
But I don't know if that is true or not
CYaBro I'm pretty sure you only need to enter your password to unlock the machine after a remote lock.