These computers are powered on and not in use. You can just sit down, log in, and start working.
    These computers are not in use, but they're either simply asleep, or, they have been powered off. You can still use them, but you'll need to wake them up or power them on before you can get started.
    In Use
    These computers are currently in use.
    Out of Order
    These computers have been taken out of use temporarily while awaiting repair.