Operating System Functions And Shareware

Operating System Functions
Perform common computer hardware functions
Provide a user interface
Provide a degree of hardware independence
Manage system memory
Manage processing tasks
Provide networking capability
Control access to system resources
Manage files

User interface:
A function of the operating system that allows individuals to access and command the computer. 

Command-based user interface:
A particular user interface that requires text commands be given to the computer to perform basic activities
E.g., unix, DOS

Graphical user interface (GUI):
A user interface that uses pictures (icons) and menus displayed on the screen to send commands to the computer system

E.g. Windows, MAC OS

Shareware (1)

distributed on the basis of an honor system. 
Most shareware is delivered free of charge, but the author usually requests that you pay a small fee if you like the program.
By sending the small fee, you become registered with the producer so that you can receive service assistance and updates.

You can copy shareware and pass it along to friends and colleagues,
but they too are expected to pay a fee if they use the product. 

Shareware is inexpensive because it is usually produced by a single programmer and is offered directly to customers. 

Public-domain Software

 Refers to any program that is not copyrighted.
Public-domain software is free and can be used without restrictions.
The term public-domain software is often used incorrectly to include freeware,
 free software that is nevertheless copyrighted.

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