2. Aims of Lesson 1
1. Go over Network test
2. What is an Operating
System?
3. Application Software
3. Operating System
The OS is the program that provides the HCI, manages
input and output and controls all Main Memory and
Backing Storage devices
The Bootstrap is a program that loads the OS from
Backing Storage
Examples
Windows XP/Vista/7/MACOS/Linux
Key functions
Providing the HCI
Displaying data on screen
Creates Hierarchical filing system
Saving files to backing storage
Provides security
Controls input/output devices
4. Application Software (Apps)
Application software does not control parts of
the computer but is written to the help the
user perform a particular task
Examples
Microsoft Word
Microsoft Excel
Itunes
Powerpoint
5. Lesson Starter
1. What is an Operating System?
2. Give 3 functions on an Operating System
3. What is Application software?
6. Aims of Lesson 2
Last Lesson
1. What is an Operating
System?
2. Application Software
Today’s Lesson
1. Standard File
Formats
2. Objects and
Operations
7. Standard File Formats
A Standard File Format is a file format that
can be opened up on many different
applications
Text
ASCII, txt, Rich Text Format
Graphics
JPEG, Bitmap, Gif
8. Objects and Operations
Application Object Operation
Word Processing Letter/Word Format Size/Style/Cut/Paste/Align
Graphics Image Crop/Rotate/Rescale
Spreadsheet Text/Number Format Size/Cut/Paste/Align
Database Field/Record Change Field Type/Sort/Search
9. Aims of Lesson 3
Last Lesson
1. What is an Operating
System?
2. Application Software
3. Standard File Formats
4. Objects and Operations
Today’s Lesson
1. Computer Virus
2. Symptoms of a Virus
3. How they Spread
4. Antivirus
10. Computer Virus
A virus is a destructive piece of software that
attaches itself to other files, reproduces, spreads
and corrupts files or data
Virus Symptoms
Strange noises or visual effects
Unexpected reboot of computer
Unwanted creation of emails
Displaying unwanted messages
How they Spread
Spread through infected memory sticks, cds
Visiting infected websites and downloading code
Downloading infected email attachments
11. Antivirus Software
Anti-virus software often works by having a
database of virus signatures (parts of code that
are viruses)
The software then scan documents, files etc
comparing them to the virus signatures
The software then flags up the virus it has
found
Antivirus software needs to be constantly
updated to add new virus signatures to the
database
12. Arrangements
Distinction between an operating system and an application program with
examples of each
Explanation of the need for standard file formats
Description of the following standard file formats for text files: text, ASCII,
rich text file
Identification of data objects and operations in the context of word
processing, databases, spreadsheets and graphic packages
Definition of a virus
Description of how a virus operates
Description of the following common symptoms of virus infection: displaying
unwanted messages, unusual visual/sound effects, computers rebooting
unexpectedly, unwanted generation of e-mails
Description of how viruses are spread via floppy disk, homemade CDs, ‘fun’
websites and e-mail attachments
Explanation of the need for anti-virus software