The original button question that attracted such a wealth of interest and witty banter was a serious one and I was grateful for the info..

Re the boot.........sarcasm can be countered via sarcasm
 
Also, if you leave the key slot in the vertical position it will lock/unlock with the remote, if you turn it thru 90 to the 3 oclock position and remove the key it will ignore the remote and can only be opened with the key by turning to the 9 oclock position.
 
I nearlly asked about that button but did a search on here and found the answer. I could not find it in the manual/handbook