ENVS 1500 Chapter 12: ENVS 1500 Chapter 12 Notes
13 May 2018
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ENVS 1500 Chapter 12 Notes – Summary
Introduction
• In a graphical system, data files may be associated with a particular application.
• This association is set up automatically by the operating system when the data file is
created, or it may be manually established by the user.
• Once the association is set up, the application can be initiated automatically by selecting
the data file.
• On most computers, for example, each data file has an icon associated with it
• The application is launched with the particular data file by double-clicking the mouse on
the data file icon.
• In Microsoft Windows, the same result can also be achieved by double-clicking the
mouse on the name of the data file within the Windows Explorer.
• To expedite the execution of programs, the system also provides a means for moving
around the system between different peripheral devices and between different storage
areas on those devices.
• Most operating systems embed these operations in a logical device and directory
structure and provide commands for moving around the structure.
• In a command line system, commands provide the ability to attach to different devices
and to change oe’s attachet fro oe directory to aother with a coad such as
cd, for change directory.
• Graphical interfaces provide file folders as the equivalent to achieve the same purpose.
• Although you are probably most familiar with running your programs interactively, most
operating systems also allow a program or sequence of programs to be run no
interactively, in a batch mode.
• The operating system allows the user to specify conditions under which the execution is
to take place
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