Necessity
As mentioned earlier, some computer programs need no installation. This was once usual for many programs which run on DOS, Mac OS, Atari TOS and AmigaOS. As the computing environment grew more complex however, the need for tangible installation presented itself.
Nowadays, a class of modern applications that do not need installation are known as portable applications, as they may be roamed around onto different computers and run. Similarly, there are live operating systems, which do not need installation and can be run directly from a bootable CD, DVD, or USB flash drive. Examples are AmigaOS 4.0, various Linux distributions, MorphOS or Mac OS versions 1.0 through 9.0. (See live CD and live USB.) Finally, web applications, which run inside a web browser, do not need installation.
Read more about this topic: Installation (computer Programs)
Famous quotes containing the word necessity:
“Then did they strive with emulation who should repeat most wise maxims importing the necessity of suspicion in the choice of our friends—such as “mistrust is the mother of security,” with many more to the same effect.... But notwithstanding the esteem which they professed for suspicion, yet did they think proper to veil it under the name of caution.”
—Sarah Fielding (1710–1768)
“The desire to serve the common good must without fail be a requisite of the soul, a necessity for personal happiness; if it issues not from there, but from theoretical or other considerations, it is not at all the same thing.”
—Anton Pavlovich Chekhov (1860–1904)
“Private property is held sacred in all good governments, and particularly in our own. Yet shall the fear of invading it prevent a general from marching his army over a cornfield or burning a house which protects the enemy? A thousand other instances might be cited to show that laws must sometimes be silent when necessity speaks.”
—Andrew Jackson (1767–1845)