aftermarket keyfob ?

saw this while flying home tonight in one of those magazines they give
you to keep you distracted from the fact that you're tearing through the
atmosphere at 500+ mph in a tin can:

http://www.skymall.com/webapp/skystore?process=prodDisplay&action=&pid=69646672&catId=94450189

Here's an excerpt:
--------
_The Car Alarm Remote Duplicator._
Imagine the jam you'd be in if your car alarm remote were broken or lost
.... The Autobahn is compatible with any system. Just place your existing
remote next to the Autobahn remote, press the alarm, keys and match the
frequencies. Presto! You have a new remote with all the same functions.
Universal Remote Control Alarm/Door Key
--------

IIRC, Saturn RKE systems use a rolling code, similar to modern garage
door openers - which means that you can match the frequency all day long
and nothing will happen except to lockout the RKE system for a few
minutes because of multiple failed attempts on the frequency it is
waiting for a code from?

Is the rolling code thing a myth? Is it easily mimiced or duplicated as
this product describes?

-rj
98SL2

 

....almost as much fun and finding an older Isuzu Trooper in the parking lot
and pressing my OEM remote buttons and hearing the Trooper set its alarm
off... (grin)

 

Maybe on some car ALARM systems this would work (though it would have to be
pretty cheesy), but I can't see how this would work with an RKE system. The
data sent by the remote on one unlock command does not give you any
information about what should be sent to unlock the doors again.

 

According to the owner's manual on my '01 lw300, there is a different code
every time the button is pressed. This makes it harder on the bad guys since
they can't just sit in a busy parking lot with a scanner and record codes
(to play back later and get access to your car). The manual has a section on
re-synchronizing the fobs if they ever get out of whack.
Oppie