One way to lock a Windows computer from your keyboard is by pressing Ctrl + Alt + Del and then selecting the "Lock" option.

They also have lock anchor holes that keep the case shut. If that solution isn't available for your desktop. The above post has the same answer with slightly more work to it. Drilling holes into cases ...

What? Only three choices? (the maybe's can choose Taco!) This is an operating-system-agnostic poll, PC, Mac, Linux, Raspberry Pi, whatever you use as your home computer. For the purpose of this poll, ...