SEB070016-TUTORIAL 3

Operating System is an Interface between User and the Computer.this is very clever software that allows you to speak to the computer and tell it what you want it to do. Before operating systems were around, there was very little you could do with a computer. Any information you needed to enter was long-winded and time-consuming - no such thing as clicking on links or icons.


OS is the most important program that runs a computer;
20 core function of operating system is:

1)enable human interaction with machine and allows us communicate with the computer and tell the computer what we want to it to do,such as searching data,save file,delete the folder,rename the folder and etc.

2)kernel
- provide access to various common core services to allother system and application programs. These services include, but are not limited to: disk access, memory management, task scheduling, and access to other hardware devices.

3)allocating the processes and resources
-allocated each process a certain amount of time to use the processer
-allocated various resources that processe will need such as computer memory stick or disk

4)security
-perform security such as prevent other user from accesing our computer system such as perform password using

5)manage software and hardware such as control the disk drives,scanner and printer

6)recognizing input from the keyboard

7)sending output to display screen

8)manage all process that are running on a computer

9)deal with error and user interaction

10)control the loading and running program

11)control the transfer data to peripheral such as scanner and printer

12)allow the user to save the data or file to a backing store

13)enable timesharing; in whiich many application program seem to be running simultaneously but are actually "taking turn" by coordinating with hardware operation

14)distributed with tools for programs to display and manage a graphical user interface

15)enable virtual memory operation for applications program,which allow flexible use of memory and enforce security

16)maintain the file system on computer

17)load application programs for execution

18)coordinating the activities on computer

19)support the creation,execution and destruction of processes

20)enable the user to search or access the data information from the internet explorer,mozila firefox and etc.