(i) It is the main program that controls the execution of user programs thus enables the user to access hardware and software resources of a computer.
OR
It is a type of system software that is used to control the execution of user applications and manage the hardware resources of a computer system and provides the interface between the user and the computer
(ii) Explain how an operating system controls I/O devices.
The operating system manages the use of input and output devices. This is done by the use buffers .The operating instructs input and output buffers to take inputs from an input device or to take outputs from the processor while the process using the input or output is suspended .when the process which needs the input is made active once again, the operating system will command the buffer to send data.
(iii) Maintaining security-in networks and larger computers each user is given a username or ID and passwords to gain access to the computer system.The operating system keeps a register of all the names so that the only persons with valid usernames or IDs passwords can access the system. The operating system keeps a log which records users logged in, the length of time each user stayed in the system and what they did.
isaacmuthini answered the question on December 18, 2017 at 12:47
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