EXERCISE 4 Answer the questions about the text

2. Why were the first programmes “complex” and “time consuming”?

3. What are the basic functions of operating system?

4. What does the abbreviation DOS mean?

5. What company developed the first version of DOS operating system?

6. What is the difference between the PC-DOS and MS-DOS?

7. What does the abbreviation NT stand for?

8.Who is the developer of OS/2?

9.What makes UNIX so different from the other operational systems?

10.What are the special features of Windows 95, Windows 98, and Windows 2000?

1. 
   UNIX
   
2. 
   DOS
   
3. 
   NT
   
4. 
   OS/2
   
5. 
   Windows 95
   

1. 
   Like NT, … is DOS compatible and provides a graphical user interface that lets you run programmes with a click of a mouse.
   
2. 
   … is the most commonly used PC operating system.
   
3. 
   … is a multi-user operating system that allows multiple users to access the system.
   
4. 
   … is an operating system developed by Microsoft, an enhanced version of the popular Microsoft Windows programmes.
   
5. 
   The usage of … is so simple that even little kids learn how to use it very quickly.