3. Name five current operating systems (other than those mentioned in Table 1.1) and identify the devices that each is designed to run on.

8. Give real-world examples of interactive, batch, real-time, and embedded systems and explain the fundamental differences among them.

10. Give at least two reasons why a regional bank might decide to buy six networked servers instead of one mainframe.

11. Select two of the following professionals: an insurance adjuster, a delivery person for a courier service, a newspaper reporter, a general practitioner doctor, or a manager in a supermarket. Suggest at least two ways that each person might use a mobile computer to work efficiently.

15. In a multiprogramming and time-sharing environment, several users share a single system at the same time. This situation can result in various security problems. Name two such problems. Can we ensure the same degree of security in a time-share machine as we have in a dedicated machine? Explain your answer.