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Possible Duplicate:
Using “Sign in” vs using “Log in”

I'm porting an old application that has a "Log on" screen. When would I use "Log on" vs the alternatives (Sign In / Log In)?

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There is some evidence that Sign In and Sign Out are generally more readily understood than the alternatives, so if you have the opportunity you should change it.

There is some relevant discussion and links to research on this similar question: Using "Sign in" vs using "Log in"

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