Lecture (7) Systems software and Application Software.Systems software and Application Software. Dr:Emad Elsharkawy Eng-Omar Salah Dr:Emad Elsharkawy 1 Sunday, 10 January 2016

Items : 1)Computer programs. 2)Systems software. 3)Application software. 4)Types of systems software. 5)Activities performed by the operating system. 6)Operating Systems Functions. 7)Graphical User Interface (GUI). 8)Definitions of Local Area Networks (LAN) and Wide Area Networks (WAN). Dr:Emad Elsharkawy 2 Sunday, 10 January 2016

Computer programs: sequences of instructions for the computer Documentation: describes program functions Software – system software and application software Dr:Emad Elsharkawy 3 Sunday, 10 January 2016

Systems softwareSystems software: coordinates the activities and functions of hardware and programs Computer system platform:Computer system platform: combination of a hardware configuration and systems software Dr:Emad Elsharkawy 4 Sunday, 10 January 2016

Application software: helps users solve particular problems In most cases, application software resides on the computer’s hard disk Application software can also be stored on CDs, DVDs, and flash or keychain storage devices Dr:Emad Elsharkawy 5 Sunday, 10 January 2016

Before you can use software, it must be installed on a computer Software for personal computers typically comes on CDs or is downloaded from the Web Most operating systems have an add/remove program feature for removing software –Does not work with all software –Does not always remove all elements of the software Dr:Emad Elsharkawy 6 Sunday, 10 January 2016

Systems software –Controls operations of computer hardware –Supports application programs’ problem-solving capabilities Types of systems software –Operating systems –Utility programs –Middleware Dr:Emad Elsharkawy 7 Sunday, 10 January 2016

Operating system (OS):Operating system (OS): set of programs that controls the computer hardware and acts as an interface with application programs Kernel : ties all components of the OS together and regulates other programs Dr:Emad Elsharkawy 8 Sunday, 10 January 2016

Various combinations of OSs, computers, and users:Various combinations of OSs, computers, and users: –Single computer with a single user –Single computer with multiple users –Multiple computers –Special-purpose computers Dr:Emad Elsharkawy 9 Sunday, 10 January 2016

Activities performed by the operating system:Activities performed by the operating system: –Perform common computer hardware functions –Provide a user interface and input/output management –Provide a degree of hardware independence –Manage system memory –Manage processing tasks –Manage files Dr:Emad Elsharkawy 10 Sunday, 10 January 2016

OS converts basic request into a set of details instruction that the hardware requires Common hardware functions (e.g.) –Get input from keyboard or some other input device –Store data on disks –Display information on a monitor or printer Dr:Emad Elsharkawy 11 Sunday, 10 January 2016

The role of Systems Software –interface between users, application software and hardware Dr:Emad Elsharkawy 12 Sunday, 10 January 2016 Figure 4.4: The Role of Systems Software

Operating Systems Functions 1.User interface and input/output management –User interface: allows individuals to access and command the computer system –Command-based user interface: requires that text commands be given to the computer to perform basic activities –Graphical user interface (GUI): uses icons and menus displayed on screen to send commands to the computer system Dr:Emad Elsharkawy 13 Sunday, 10 January 2016

2.Hardware independence –Application program interface (API): allows applications to make use of the operating system 3.Memory management –Control how memory is accessed and maximize available memory and storage Dr:Emad Elsharkawy 14 Sunday, 10 January 2016

Dr:Emad Elsharkawy 15 Sunday, 10 January 2016 Figure 4.6: Application Program Interface Links Application Software to the Operating System

Current Operating Systems Microsoft PC operating systems –PC-DOS and MS-DOS: early, command-driven OSs –Windows XP: greatly improved stability and security over previous versions of Windows –Windows XP N: for European market –Windows XP Professional X64: for computers with newer 64-bit capabilities –Windows XP Media Center Edition: incorporates additional multimedia features –Vista: latest version of Windows Dr:Emad Elsharkawy 16 Sunday, 10 January 2016

–Linux –Developed by Linus Torvalds in 1991 –Open-source product –Only the kernel of an OS –Several distributions available with capabilities/applications that form a complete OS Examples: Red Hat Linux, Caldera OpenLinux Dr:Emad Elsharkawy 17 Sunday, 10 January 2016

Workgroup Operating Systems: Windows Server UNIX NetWare Red Hat Linux Mac OS X Server Dr:Emad Elsharkawy 18 Sunday, 10 January 2016

Application Software Primary function is to apply the power of the computer to give individuals, workgroups, and the entire enterprise the ability to solve problems and perform specific tasks Application programs interact with systems software; systems software then directs computer hardware to perform the necessary tasks Dr:Emad Elsharkawy 19 Sunday, 10 January 2016

Personal Application Software Serves the needs of an individual user Includes personal productivity software –Enables users to improve their personal effectiveness Dr:Emad Elsharkawy 20 Sunday, 10 January 2016

Personal Application Software Dr:Emad Elsharkawy 21 Sunday, 10 January 2016

Dr:Emad Elsharkawy 22 Workgroup application software: support teamwork, whether people are in the same location or dispersed around the world Groupware: software that helps groups of people work together more efficiently and effectively Sunday, 10 January 2016

Understand the Term Graphical User Interface (GUI) A Graphical User Interface (GUI): A Graphical User Interface (GUI): is simply an additional part of the operating system that displays windows and drop down menus, and also enables you to drive your computer using a mouse. Dr:Emad Elsharkawy 23 Sunday, 10 January 2016

Information Networks Dr:Emad Elsharkawy 24 Sunday, 10 January 2016

Know the Definitions of Local Area Networks (LAN) and Wide Area Networks (WAN). LAN LAN A LAN (Local Area Network) is a system whereby individual PCs are connected together within a company or organization Dr:Emad Elsharkawy 25 Sunday, 10 January 2016

WAN WAN A WAN (Wide Area Network) as the name implies allows you to connect to other computers over a wider area (i.e. the whole world). Dr:Emad Elsharkawy 26 Sunday, 10 January 2016

The Internet The Internet is a global network of interconnected networks. The unique thing about the Internet is the sheer amount of information that you can access from it. Whatever your interest you can search for and find information on the most obscure topics. Dr:Emad Elsharkawy 27 Sunday, 10 January 2016

To search the Internet you use what are called Internet search engines. These are easily accessed via your Internet browser (i.e. Microsoft Internet Explorer or Netscape Navigator/Communicator). Within the search engine you enter a word or phrase and it will retrieve documents from the Internet based on the information you typed in. Dr:Emad Elsharkawy 28 Sunday, 10 January 2016

Thanks Dr:Emad Elsharkawy 29 Sunday, 10 January 2016