How personal are your passwords?

One thing I don’t miss is the error message that pops up on the computer screen: “This file is locked by another user BSMITH. Do you want to open a read-only copy?”
I look at BSMITH’s desk and he has gone home. In fact BSMITH — not his real username — waltzed out of the office and now has his out-of-office reply on and it’s telling everyone to contact me.