What does an operating system consists of?
What is the main program in an operating system called?
What is another name for an operating environment? 
What is loading the operating system in a personal computer called?
Which one of the following uses graphical icons?
What is the time between the user’s request and the computer’s reply called?
What is an onscreen picture that represents an object, such as a program or file, called? 
What is the signal that the computer is awaiting a command from the user called? 
What does the acronym NOS refer to?
Which of the following operating systems contained the first commercially successful GUI?