BUSINESS COMPUTER APPLICATION University of Palestine College of Business Instructor: Mr. Ahmed Abumosameh

COMPUTER SOFTWARE Lecture 4.2

3 Chapter 8 Operating Systems and Utility Programs

System Software System software is set of programs that control the operations of a computer and devices attached with computer. It create link between user and computer as well as controls the execution of application programs. The examples of system software are Operating System, Utility Programs, Device Drivers and Language Processors.

Operating System Operating System provide interface between user and the computer. Operating System is a collection of system programs that control and coordinate the overall operations of a computer system and allow the user to communicate with computer and run other application software.

Functions of Operating System Booting a Computer User Interface  Command Line User Interface  Graphical User Interface Running Programs Managing Files Memory Management Scheduling Jobs Configuring Devices Establishing Internet Connection Controlling Network Task Management

7 Operating System Functions What is booting?  Cold boot Turning on computer that has been powered off  Warm boot Restarting computer that is powered on Warm boot from Windows desktop Warm boot from system unit  Process of starting or restarting a computer

8 What messages display on the screen when you boot the computer?

9 Operating System Functions What is a recovery disk? --- Contains system files that will start computer when computer cannot boot. Also called boot disk ---floppy disk, Zip, CD, DVD

10  Foreground contains application you are using  Background contains programs that are running but are not in use Operating System Functions What is single user/ multitasking?  Working on two or more programs that reside in memory at same time all running processes

11 Operating System Functions What are other program management features of operating systems?  Multiprocessing: Can support two or more processors running programs at same time v Multiuser: Enables two or more users to run programs simultaneously v Fault-tolerant computer: Continues to operate when one of its components fails Has duplicate components such as processors, memory, and disk drives

12 Operating System Functions Optimizing use of RAM What is spooling?  Sending print jobs to buffer instead of directly to printer  Print jobs line up in queue What is a device driver?  Program that tells operating system how to communicate with device Also called driver v With Plug and Play, operating system automatically configures new devices as you install them

13 Types of Operating Systems What are three categories of operating systems? Stand-alone: complete operating system working on PC, laptop, mobile computing device. like DOS, Windows, Mac OS X, Unix, Linux Network: OS designed specially to support a network, like netware, windows server 2003,Unix, Linux and Solaris Embedded : OS on most PDA and small devices Like, windows CE.net, windows mobile 2003, Palm OS and Symbian OS

14 Stand-Alone Operating Systems How do Windows versions compare? Windows VersionYear Released Windows 3.x1990 Windows NT Windows Windows NT Workstation Windows Windows Millennium Edition 2000 Windows 2000 Professional2000 Windows XP2001

15  Microsoft’s fastest, most reliable Windows operating system Stand-Alone Operating Systems What is Windows XP?  Available in three editions: 1. Home Edition, 2. Professional Edition, and 3. Tablet PC Edition

16 characteristics of operating systems  Device-dependent Runs only on specific type of computer v Proprietary software Privately owned and limited to specific vendor or computer model v Device-independent Runs on many manufacturers’ computers v Downward compatible Works with application software written for earlier version of operating system v Upward compatible Runs on new versions of operating system

17 Network Operating Systems v Allows users to share printer, Internet access, files, and programs on a network v Administers security by establishing user name and password for each user NetWare Designed for client/server networks Windows Server 2003 Upgrade to Windows 2000 Server OS/2 Warp Server for e-business IBM’s network operating system for businesses Solaris  Version of UNIX developed by Sun Microsystems  Specifically for e-commerce applications

18 Embedded Operating Systems What is an embedded operating system?  Found on most mobile computers, PDAs, and other small devices  Windows CE.NET is scaled-down version of Windows

19 Embedded Operating Systems What are two operating systems for PDAs?  Pocket PC 2002 for Pocket PC  Palm OS for Palm, Visor, and CLIE

20 Utility Programs utility program  System software that performs maintenance-type tasks

21 Utility Programs What is a disk scanner?  Detects and corrects problems on hard disk or floppy disk  Searches for and removes unnecessary files What is a backup utility?  Copies selected files or entire hard disk onto another disk or tape  compress files during backup to require less storage space

22 Utility Programs What is a disk defragmenter? file before defragmenting fragmented disk file after defragmenting  Reorganizes files and unused space on hard disk so programs run faster

23 Utility Programs What is a screen saver?  Causes monitor’s screen to display moving image or blank screen if there is no activity for a specified time  To secure computer, user configures screen saver to require password to deactivate

24 Utility Programs What is a diagnostic utility?  Compiles technical information about hardware and some software  Prepares report outlining problems

25 Stand-Alone Utility Programs What is an antivirus program?  Identifies and removes viruses in memory, storage media, and incoming files  Must be updated frequently What is a virus?  Potentially damaging computer program  Affects computer without user’s knowledge SIGNS OF VIRUS INFECTION

26 Stand-Alone Utility Programs What is a file compression utility?  Shrinks size of files to free up room and improve performance  Compressed files are sometimes called zipped files  Two popular utilities: PKZIP TM and WinZip ®

27 Stand-Alone Utility Programs What is a personal firewall?  Protects personal computer from unauthorized intrusions  Monitors all transmissions to and from computer