What is the terminal that is entirely dependent for all its processing activities on the computer system to which it is hooked up?

The terminal that is entirely dependent on the computer system to which it is connected is known as a "thin client." Unlike a fat or thick client, which can perform processing tasks on its own, a thin client relies on the server for all processing activities, including data storage and application execution. This setup reduces the need for powerful hardware on the client side, as it primarily serves as an interface for users to access remote resources.