shareware: is software that is free for the trying, with a send-payment if-you-keep-it honor system.
public domain: creative work or intellectual property that is freely usable by anyone, either because the copyright has expired or because the creator obtained a Creative Commons license for the work.
freeware: software that is free for public use.
commercial software: software that is designed and developed for sale to the general public, or that serves commercial purposes
integrated software: software that combines several most commonly used applications into one package
Review Questions:
2- Compilers and other translator programs compile a complete translation of the program in a high-level computer language before the program runs for the first time. Software applications allow users to control computers and perform certain actions without being a programmer. System software is software that handles details such as which parts of the computer's memory hold a document. It includes the operating system and utility programs.
3- The operating system must be first installed because it is what communicates with the hardware and makes using software possible.
5-A single-user operating system allows the user to run multiple applications at the same time by creating tasks. Since the CPU can only perform one process at a time, the OS does task scheduling. It also manages virtual memory. Multi-user OSs are responsible for authentication (user names and passwords) and authorization (allowing only those with adminstrative priviliges to install or uninstall application programs).
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