[Zeke]

Having been a door and window installer for 25 years I can say that almost any patio door unit comes with a different style of lock. The cylinders can be changed somewhat, but they basically do not use the most common 2 key configurations.

Going with that and thinking your average "lock bumper" or raker is not going to have the ability to defeat these as quicky and will just 'break' in. So I buy Yale locks for entry doors because they are not common. The interlocking Yale is the best thing for a pair of French doors, or any double door.

being old fashioned, of just being old, I don't need another password or code. The fingerprint thing sounds interesting though. Thanks for the thread.