>an interesting file locking mechanism Only 5 years ago, we had an 'editing stick'. Only the person physically in possession of the editing stick was allowed t

>an interesting file locking mechanism Only 5 years ago, we had an 'editing stick'. Only the person physically in possession of the editing stick was allowed to make edit the configs to our (early 90's vintage) SCADA system. Frankly the system worked very well: "if it ain't broke, don't fix it". We only got rid of the editing stick when the machinery in question was scrapped.