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  => 1 Introduction To Computing
  => 1.1 Computer Hardware
  => 1.2 Computer Software
  => 1.3 The Human-Computer Interface
  => 1.4 Business Information Systems
  => 1.5 Batch Processing
  => 2 Word Processing
  => 2.1 Introduction
  => 2.2 Editing Facilities
  => 2.3 Bullets And Numbering
  => 2.4 Layout Facilities
  => 2.5 Headers And Footers
  => 2.6 Style Controls
  => 2.7 Spelling And Grammar Checking
  => 2.8 Inserting Columns
  => 2.9 Borders And Shading
  => 2.10 Tables
  => 2.11 Inserting Graphics
  => 2.12 Mail Merging
  => 2.13 Macros
  => 3 Programming In QuickBASIC
  => 3.1 Introduction
  => 3.2 Variables, Input And Output
  => 3.3 Arithmetic Operators
  => 3.4 Iteration
  => 3.5 Selection
  => 3.6 Functions
  => 3.7 Subprograms
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  => 3.11 Jackson Structure Diagrams
  => 3.12 String Processing
  => 4 Data Representation
  => 4.1 Different Computer Codes
  => 4.2 Binary Integers
  => 4.3 Higher Number Bases
  => 4.4 Graphics, Sounds And Other Interpretations
  => 4.5 Fixed Point Binary Numbers
  => 4.6 Floating Point Binary Numbers
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  => 5 Spreadsheets
  => 5.1 Introduction
  => 5.2 General Features
  => 5.3 "What If" Calculations
  => 5.4 Changing The Workbook's Appearance
  => 5.5 Relative And Absolute Reference
  => 5.6 Sorting And Filters
  => 5.7 Charts
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  => 5.9 The IF Function
  => 5.10 Goal Seeker
  => 5.11 Solver
  => 5.12 Macros
  => 6 Files
  => 6.1 File Concepts
  => 6.2 Serial & Sequential Files
  => 6.3 Indexed Sequential Files
  => 6.4 Random Access Files
  => 6.5 Overview of File Processing
  => 7 Standard Algorithms
  => 7.1 Linear Searches
  => 7.2 Binary Search
  => 7.3 Internal Sorting
  => 7.4 External Sorting
  => 8 Legal Issues And Data Security
  => 8.1 The Computer Missuse Act 1990
  => 8.2 The Data Protection Act 1984
  => 8.3 Computer Fraud
  => 8.4 Software Copyright
  => 8.5 Viruses And Trojans
  => 8.6 Security Of Data
  => 8.7 Data Integrity
  => 9 Databases
  => 9.1 Flat-file Databases
  => 9.2 Introduction To Relational Databases
  => 9.3 The Aims Of Database Normalisation
  => 9.4 Security And Integrity Issues
  => 9.5 Database Management
  => 10 Data Structures
  => 10.1 Introduction
  => 10.2 Linear Lists
  => 10.3 Linked Lists
  => 10.4 Queues
  => 10.5 Stacks
  => 10.6 Binary Trees
  => 11 Systems Development
  => 11.1 Introduction
  => 11.2 Analysis
  => 11.3 Design
  => 11.4 Graphical System Representation
  => 11.5 Development
  => 11.6 Testing
  => 11.7 Implementation
  => 11.8 Maintenance
  => 11.9 System Documentation
  => 12 Peripherals
  => 12.1 Input Devices
  => 12.2 Output Devices
  => 12.3 Storage Devices
  => 13 Computer Architecture
  => 13.1 The Processor And Memory
  => 13.2 The Fetch-Execute Cycle
  => 13.3 Data Buses
  => 13.4 Processing Architectures
  => 13.5 Assembly Language
  => 14 Translation
  => 14.1 Interpreters
  => 14.2 Compilers
  => 14.3 Compilation Phases
  => 14.4 Assemblers
  => 15 Operating Systems
  => 15.1 Operating System Functions
  => 15.2 Different OS Modes
  => 15.3 Job Control Language
  => 15.4 The Scheduler And Dispatcher
  => 15.5 Memory Management
  => 15.6 Peripheral Control
  => 15.7 Backing Store Management
  => 16 High Level Programming
  => 16.1 High And Low Level Languages
  => 16.2 Language Classification
  => 16.3 Language Generations
  => 16.4 Logic Programming
  => 16.5 Choosing A Programming Language
  => 17 Computers & Communication
  => 17.1 Data Transmission
  => 17.2 Local Area Networks
  => 17.3 Wide Area Networks
  => 17.4 The Internet
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15.2 Different OS Modes
Section 15.2

Operating Systems

15.2 Different OS Modes

These modes decide the method of program execution.

  1. Single program operation - one program running
  2. Multiprocessing - OS controls more than one CPU
  3. Multiprogramming - Programs run concurrently
    1. Multiuser - different users, different programs
    2. Batch - several jobs can be run at once
    3. Multitasking - different users, one program
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