In a PC you save a lot of documents that are private and confidential, and shouldn`t be read by those without your permission. To keep your privacy safe it is good to have a security tool like Password Protected Lock.
The aim of Password Protected Lock is to directly block the desktop, so that no-one can access anything. It is totally inaccessible unless you can unblock it by using the corresponding password.
This block not only activates when you start the PC, but also when the PC passes a certain amount of time inactive.