Once you have logged in to Home banking, you have begun an active session. If you walk away during the course of an active session, someone else can use your computer to perform transactions involving your accounts. It is similar to walking away from an ATM while your card is still in the machine. Therefore, for your security, Home banking will automatically end your active session if there is no activity on your PC for about 10 minutes. However, to eliminate any exposure it is always better for you to end the active session when you're done.