At one place I worked at someone left their PC unlocked when they went for a cup of coffee. It wasn't until some time later that they realised that some 'jokers' had changed the home page of their internet site to a pornographic website.
The lesson is that you should AWLAYS lock your PC when you are away from it. Even if you are only stepping away for 15 seconds to pick up something, make a cup of tea or look at something in the next room. You press the CTRL, ALT and DELETE buttons at the same time and then choose 'lock computer' from the various options.
When you return to your desk you press the CTRL, ALT and DELETE buttons at the same time again and enter your password to unlock your PC.
It sounds paranoid but it isn't. It's good practice. It's not just that someone coud maliciouly interfere with your PC's settings for a 'joke'. It's because there are nosey people about who like to see what's in your Inbox, and even what kind of documents you have. They don't need to physically do anything with your keyboard, they can just peer at your screen. And given that all of us have private or confidential stuff on our PCs it's better to be safe than sorry.
So lock your PC. I always do.
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