On Sat, 24 Aug 2013 13:43:21 -0400 john Culleton <John at wexfordpress.com> dijo:
>Decades ago some text editors stored multiple editions of a file, but >the later editions were just the additions and subtractions, the >deltas if you like, from the last version. You could always >back up to any of a number of versions. Univac 1108 had such an editor. >The *nix "diff" command can be run in a way that creates such a delta. I recall that Microsoft Word stored previous edits of the document within the document. One day an irate employee wrote a letter to the boss and started it with "Dear <expletive deleted>," but before e-mailing the letter changed it to Dear Mr. <Name>. Unfortunately, the boss opened the letter in a different program and could see all the edits. This did not go well for Microsoft.
