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Should I use Yes/No or Ok/Cancel on my message box?
Using a verb makes the outcome much more clear than Yes/No, OK/Cancel.
Undo History - Why limit it?
It's a much more difficult engineering problem than 'just writing it out to the hard disk as a temporary file.' Virtual memory does that. Once you have 2 levels of undo, an arbitrary level of undos is usually a matter of resource constraints like RAM. A common phrase is "two is not a number" and comes from ideas like c2.com/cgi/wiki?ZeroOneInfinityRule