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Of course a timesheet is a really complicated piece of software. I mean, you've got to enter the time you started, the time you ended and the time you spent on lunch for every day of a whole week. This kind of bleeding-edge functionality just can't be done in your ordinary, plain-vanilla browser, you know!
Wow, you certainly couldn't do useful stuff like this in a cross-platform manner without spending megabucks, I'm sure!