User:SAIDI NGOTEYEGA/sandbox

INTRODUCTION TO COMPUTER A computer is  defined  as  an electronic  machine  that  is capable of storing  data  retrives  a stored  data  and manupulates  by  obeying  the set  of  logical instractions known  as programs OR Computer is  a data  processing  machine or  device. This particular machine  accepts  an input  of  data  or  information  in one  form  and proceses  it  to produce  an out put  of information  in another  form. Particular in more intelligible  and logical manner.The  most  common  and widely  used  computer  is the  personal  computer  or  pc. A COMPUTER  IS MACHINE,  IS DIVEDED  INTO  TWO MAIN  PARTS (1)	COMPUTER HARDWARE (2)	COMPUTER SOFTWARE COMPUTER HARDWARE These are the physical parts of computer machine. Example of computer hardware  is mouse,key board,screen(monitor  or  V.D.U-Video  Display  Unit,printer,U.P.S (Uninterrupted  Power Supply),C.P.U(Central Processing Unit),Flash Disk, and scanner  e.t.c Hardware  is grouped into  three  parts which  are  Input  parts,Processor  and  Out parts.               INPUT  DEVICES;Get  data in the  computer. Eg  Mouse,Keyboard,Compact disk(CD –ROM),Scanner modem.               OUTPUT  DEVICES;Get  data  out of  computer.Eg  Printer,Monitor,Speakers,Central Processing Unit,Control Unit(C.U),Arithmetic  and  Logic Unit(ALU)                       COMPUTER  SOFTWARE/COMPUTER  PROGRAM.  A computer  software, or computer program is the set of  logical instructions  that when kept  in the computer`s memory  can  perform the  work for  a  document,account,making  publication,designing  graphics  etc.              The  computer  software is devided  into two parts which  are:- (1)OPERATING SYSTERM  SOFTWARE (2)APRICATION SOFTWARE (1)OPERATION SYSTERM SOFTWARE This is software which guides  the  perfomance of the  computer  systerm  and  makes  the computer  processes  transport  to the  computer  operator. The systerm software  helps  the  computer  operator  to perform  same  operations  very  easly   for example  copying  files,deleting files,making  folders,programs  instailations,etc Example systerm software  is the  MS DOS(Microsoft  disk  operating system),UNIX  WINDOW  2000 XP,etc. (2)APPLICATION SOFTWARE This is a computer program that helps  the computer  operator  or computer user  to perfom  a specific  work.The  work  can be typing a secretarial  work,accounting,preparing a budget,marketing publication,Advertise.etc Example of application software (1)WORD PROCESSING:Example MS word.Help to edit your document report.etc (2)SPREAD SHEET:Example MS Excell.Help to do accounts,budget statistics,Data analysis and other  mathematics (3)DISK TOP PUBLISHING:Example Page maker and  MS publisher.Help to make publication,News paper,Headed paper,Invitation or  Greeting cards,Tickets,etc (4)POWER POINT:Help tomake presentations,Slides,Advertisements to  animations,Projects presentations,Annoucement  flyer,Personal home page  on the internet. (5)DATA BASE:Example MS Access ,help to keeps record  collection of the data in the form of  records. (6)GRAPHICS:Example Coral draw,Adobe illustrator,Adobe photoshop,Adobe page maker. (7)COMPUTER GAMES:Examle Solitaire drop,Spides solitaire,FATE.Help to play  card game. WINDOWS Windows is a graphical user interface screen  of an operating system  intaining icon,dialogy boxes,menu  and  more. COMPUTER VIRUS A computer virus is a programs that reproduces  its own cake by attaching its self to other cumputer  files  and computer user  document files  including mails document  in such a way that the virus code is executed  or open  at the same time partially damaging  or  completely  destroy them. Virus mast do this without the permission or knowledge  of computer  operator. ANT-VIRUS Is the computer program that removes virus in computer system.There  are number  of companies  that make  ant-virus software.The ant-virus software is the program  that  must  be installed in your  computer  to attack any  strange that might cause your computer  problems.

TYPE OF COMPUTER: MAIN FRAME COMPUTER: Are the largest computer. They can handle large amount of information very quickly and be used by man /people at the same time. They are usually found in large institutions like Universities and government department.

MICRO COMPUTERS: Commonly called Person Computer or PC’S. Are much smaller and are commonly Used in business, education and home computing.

PORTABLE COMPUTER: Also known as Laptops are very popular now days. They are about the size of an A4 paper and about one inch thick.They are mainly used by people who travel very much and need to have a computer during the journey or at the far away destination. They can also opened by using rechargeable batteries.

A MOUSE: This an input device with two or more button.It moves mouse pointer and person the device rest on mouse pad.

MOUSE CLICK CLICK-Press once left mouse button DOUBLE CLICK-Press twice left mouse button RIGHT CLICK-Press once right mouse button SCROLL-Use middle mouse button

KEY BOARD This input device with several keys and buttons

HOW TO START ON A COMPUTER 1. Ensure proper connection first 2. Switch on power main switch 3.Switch on UPS 4. Switch on CPU 5. Switch on Monitor

HOW TO SHUTDOWN A COMPUTER 1. Save all your works 2. Exit All programs 3. Click start button 4. Click shutdown / turn off computer 5. Click OK / turn off 6. Switch off monitor 7. Switch off CPU 8. Switch off UPS 9. Cover your computer

COMPUTER DESKTOP It is the first display after loading operation Syterm, it consist of . Several icon for applications files or folders and program . Task bar . Start button . Screen background . Time and date

COMMON ICONS ON DESKTOP . My computer . My document . Recycle bin . Intenet

HOW TO OPEN WORDPAD PROGRAM . Click start button . Point program . Point accessories . Point notepad

HOW TO SAVE A FILE . Open program . Type your work .Click file .Point save as . Type file name . Click save

HOW TO CLOSE A FILE . Click file . Click Exit

HOW TO OPEN A FILE . Open your program . Click file . Point open . Choose your file name . Click open

HOW TO OPEN PAINT PROGRAM . Click start button . Point program . Point accessories . Click paint