Centralized computing: Difference between revisions

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== History ==

The very first computers did not have separate terminals as such; their primitive input/output devices were built in. However, soon it was found to be extremely useful for multiple people to be able to use a computer at the same time, for reasons of cost – early computers were very expensive, both to produce and maintain, and occupied large amounts of floor space. The idea of centralized computing was born. Early [[text terminal]]s used electro-mechanical [[teletypewriter]]s, but these were replaced by [[cathode ray tube]] displays (as found in 20th century televisions and computers). The text terminal model dominated computing from the 1960s, until the rise to dominance of [[home computer]]s and [[personal computer]]s in the 1980s.

== Contemporary status ==

As of 2007, centralized computing is now coming back into fashion – to a certain extent. Cloud computing has had an important role in the return of centralized computing.<ref>{{Cite journal|last=Irion|first=Kristina|date=December 2012|title=Government Cloud Computing and National Data Sovereignty|url=http://dx.doi.org/10.1002/poi3.10|journal=Policy & Internet|volume=4|issue=3-4|pages=40–71|doi=10.1002/poi3.10|issn=1944-2866|url-access=subscription}}</ref> [[Thin client]]s have been used for many years by businesses to reduce [[total cost of ownership]], while [[web application]]s are becoming more popular because they can potentially be used on many types of computing device without any need for software installation. Already, however, there are signs that the pendulum is swinging back again, away from pure centralization, as [[thin client]] devices become more like [[diskless workstation]]s due to increased computing power, and web applications start to do more processing on the client side, with technologies such as [[AJAX]] and [[rich client]]s.

In addition, [[Mainframe computer|mainframe]]s are still being used for some mission-critical applications, such as payroll, or for processing day-to-day account transactions in banks. These mainframes will typically be accessed either using [[terminal emulator]]s (real terminal devices are not used much any more) or via modern front-ends such as [[web application]]s – or (in the case of automated access) [[Communications protocol|protocols]] such as [[web service]]s protocols.

== HybridDiskless clientnode model ==

Some organizations use a [[hybriddiskless clientnode]] model partway between centralized computing and conventional desktop computing, in which some applications (such as [[web browser]]s) are run locally, while other applications (such as critical business systems) are run on the [[terminal server]]. One way to implement this is simply by running [[remote desktop software]] on a standard [[desktop computer]].

== Hosted computing model ==