does a car have a keyless entery?

my brother has 2 sentras (99 and 2001)
both of them dont have keyless fobs
but i think that a 2001 should definetly have one
and my 99 altima had it so i think that 99 might have it 2
how do i check the cars have keyless hardware installed ?
thanks to everyone who responds

keyless entry I'm pretty sure came as an option in the 99 I have a 99 and I technically have keyless entry but I dont have a remote. And by the way its remote entry lol that might be why you havn'r gotten any responses keyless is when you have the doors that pop open

check http://www.remotesunlimited.com/

thanks
dude many sites call it keyless entery even ebay
by the way if u dont have a remote check ebay
it is only $15
i got one for my altima

I know haha I just felt like being a dick lol you know how those people are that correct everything you say even though its totally pointless haha my bad