Read more in her journal entry here.
Now, Allie and I personally tested this, so I know it isn't an Urban Legend. However, I would recommend that you try this for yourself, because it may not work on all cars with remote entry, and you may need to find the spot around your car where it works best. For us, it appears to be beside the front passenger door. I have a 2003 Honda Pilot and it worked. It really, really worked!