When you have a mess on your desk you have always something that drops on your keyboard, causing lots of characters to appear where you don't want them. With your keyboard locked, you can place anything on your keyboard without your keyboard going beserk. You can (un)lock your keyboard by pressing the left and right Ctrl key simulatiously (or at least within half a second). A small window will pop-up, telling you the status of your keyboard. You can also use the icon in the tray to (un)lock your keyboard. Ctrl+Alt+Del works with my keyboard locked! The Keyboard Locker application was designed to be a small tool that will help you lock or unlock your keyboard.