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Software (System Software (Operating Systems (Manages main memory…

- - - - WIMP
        
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    - - Manages how the programs share the processor
        
        Each take it in turns to use processing time
    - - Allocates blocks of free space in memory
      - Frees up this space when you stop using the program/data
      - Keeps a record of where each program and its data are located
      - Manages where on the disk files are written (acts as a phone directory for file locations)
    - - Uses a device driver to communicate with and manage input and out put devices
      - Storage device management
        
        Copying files fromdisk to main memory
        
        Copying data files back to secondary storage
    - - Interacts with applications using an Application Programming Interface (API)
    - - Password protection on individuals
      - Controls access rights
  - - - Anti-Virus software
        
        Prevents virsuses from being installed
        
        Prevents system files being deleted or changed
        
        Detects and removes viruses that manage to install themselves
      - Spyware protection
        
        Detects spyware programs and prevents them from installing themselves on your computer
      - Firewalls
        
        Prevents unauthorised access to a computer or network from the internet
        
        Can use filtering to prevent access to unsuitable sites from a computer or network
      - Back-up and recovery programs
    - - Filme management
        
        Tools used for moving, copying and deleting folders and files
      - Repairing corrupt files
        
        Scans the damaged file and extracts the maximum data from it to create a new, usable file
      - Disk defragmentation
        
        Reorganises files so they are stored together
        
        Processing time reduces so performance is improved
        
        Free space is also in one place so new files do not have to be fragmented
    - - Automatic updates
        
        Looks for recent updates on the internet and downloads and installs new versions
      - Backup utilities
        
        You need to save the backed up data onto an external hard drive
        
        Creates a backup of your files on a regular schedule
      - Compression utilities
        
        Compresses files so they take up less space
        
        Useful if you want to transmit large files via the internet