How is PERMISSION granted when owner is not present?

When a visitor touches object A, it will rez object B.
Object B has a llRequestPermissions(llGetOwner(), TYPE OF PERMISSION);
How will permission be granted since the owner may be off line?

I've tested it and the permission is granted but they say not to rely on it being granted.
If it works once will it work all the time?

grant permission in state_entry before dropping into object A
state_entry runs only once when saved or reset
object B should not have an on_rez resetscript

OK thanks. That is what I was doing and it appears that the original permission sticks though un-rezzing/saving, placing in A's inventory, and subsequently re-rezzing.

yes state_entry is only run once
thats why a lot of listen getowner wont work in a transfer with out a reset