The answer is that TeamViewer has a feature that allows a remote access to the computer without a password or a user’s permission. This is a feature that is quite useful for the following scenarios:
When you are at a remote location and you need to access your computer at home.
When you are at a remote location and you need to access your computer at work.
When you are at home and you need to access your computer at work.
When you are at work and you need to access your computer at home.