What are the preferred use cases for the following sets of terms:
- Log in / Log out
- Log on / Log off
- Sign in / Sign out
- Sign on / Sign off
From what I can guess, "Logging in" should be used for a long-lived session (like a website), whereas "Sign in" should be for something that you will be attending to (like IM or a financial transaction).
I'm a little fuzzy here...