Key fobs are magical things. On many car models, the electric remotes that lock and unlock the doors and trunk come standard, but a convenient feature of the key remote has long gone unused by many car owners.

The remotes can often lower a car's windows, allowing owners to start airing out the car before hopping inside.

According to CNET, the trick usually involves pressing the remote's unlock button, releasing it, then pressing it again and holding down. In some cars, simply inserting the key in the lock, turning it counterclockwise, releasing, then turning it counterclockwise again and holding will do the trick.

The trick is usually explained in owner's manuals, but it has also been discussed online, although it has yet to gain widespread attention.

In order to try to confirm how many car keys could be used to roll down windows, CNET ultimately turned to social media, conducting an internal poll, and reaching out to Reddit users. Their combined list includes 19 makes and models so far. (Click here to see the list.)

Car owners who are intimidated by the often lengthy and sometimes complicated owner's manuals can find a wealth of resources online, often through Internet automative forums such as Edmunds.com or CarForums.net.

In 2009, automaker Chrysler began doing away with paper manuals, according to The New York Times. Instead, a slimmed-down user guide and DVD will come standard on Chrysler models, a move the company said will save 930 tons of paper annually, or 20,000 trees.