On May 25, 2016, at 11:11 AM, John Robinson <profilecoven...@me.com> wrote:

> Lee, this system sounds similar to the random numerical number generator used 
> in newer garage door openers with the remote unit.

It’s probably the same idea. A pseudo-random number generator chip can be had 
for a couple of dollars, so it’s pretty cheap and easy to implement.

L^2

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