Editing Online and offline (section)

==Examples==

===Offline e-mail===
One example of a common use of these concepts with [[email]] is a [[mail user agent]] (MUA) that can be instructed to be in either online or offline states.  One such MUA is [[Microsoft Outlook]]. When online it will attempt to connect to mail servers (to check for new mail at regular intervals, for example), and when offline it will not attempt to make any such connection. The online or offline state of the MUA does not necessarily reflect the connection status between the computer on which it is running and the Internet i.e. the computer itself may be online—connected to the Internet via a cable modem or other means—while Outlook is kept offline by the user, so that it makes no attempt to send or to receive messages. Similarly, a computer may be configured to employ a [[dial-up Internet access|dial-up connection]] on demand (as when an application such as Outlook attempts to make a connection to a server), but the user may not wish for Outlook to trigger that call whenever it is configured to check for mail.<ref name="Mann">{{cite book|pages=[https://archive.org/details/howtodoeverythin00mann/page/76 76&ndash;77]|title=How to Do Everything with Microsoft Office Outlook 2003|author=Bill Mann|publisher=McGraw-Hill Professional|year=2003|isbn=0-07-223070-3|url=https://archive.org/details/howtodoeverythin00mann/page/76}}</ref>

===Offline media playing===
Another example of the use of these concepts is [[digital audio]] technology. A [[tape recorder]], [[digital audio editor]], or other device that is online is one whose clock is under the control of the clock of a synchronization master device. When the sync master commences playback, the online device automatically synchronizes itself to the master and commences playing from the same point in the recording. A device that is offline uses no external clock reference and relies upon its own internal clock. When many devices are connected to a sync master it is often convenient, if one wants to hear just the output of one single device, to take it offline because, if the device is played back online, all synchronized devices have to locate the playback point and wait for each other device to be in synchronization.<ref>{{cite book|title=Audiopro Home Recording Course: A Comprehensive Multimedia Audio Recording Text|author=Bill Gibson|pages=155|year=1998|publisher=Hal Leonard|isbn=0-87288-715-4}}</ref> (For related discussion, see [[MIDI timecode]], [[Word clock]], and recording system synchronization.)

===Offline browsing===
{{main|Offline browsing|}}
A third example of a common use of these concepts is a [[web browser]] that can be instructed to be in either online or offline states. The browser attempts to fetch pages from servers while only in the online state. In the offline state, or "offline mode", users can perform '''offline browsing''', where pages can be browsed using local copies of those pages that have previously been downloaded while in the online state. This can be useful when the computer is offline and connection to the Internet is impossible or undesirable. The pages are downloaded either implicitly into the web browser's own [[browser cache|cache]] as a result of prior online browsing by the user or explicitly by a browser configured to keep local copies of certain web pages, which are updated when the browser is in the online state, either by checking that the local copies are up-to-date at regular intervals or by checking that the local copies are up-to-date whenever the browser is switched to the online. One such web browser is [[Internet Explorer]]. When pages are added to the Favourites list, they can be marked to be "available for offline browsing". Internet Explorer will download local copies of both the marked page and, optionally, all of the pages that it links to. In Internet Explorer version 6, the level of direct and indirect links, the maximum amount of local disc space allowed to be consumed, and the schedule on which local copies are checked to see whether they are up-to-date, are configurable for each individual Favourites entry.<ref>{{cite book|title=Good Web Guide|author=Arabella Dymoke|year=2004|publisher=The Good Web Guide Ltd|isbn=1-903282-46-2|pages=17|chapter=an a to z of internet terms}}</ref><ref>{{cite book|title=The Complete Idiot's Guide to Wireless Computing and Networking|author=Paul Heltzel|chapter=Wireless Road Tricks|year=2002|publisher=Alpha Books|isbn=0-02-864287-2|pages=205}}</ref><ref>{{cite book|title=The Internet Companion: The Easy Australian Guide|author1=Glen Waller  |author2=Vanessa Waller |name-list-style=amp |year=2000|publisher=UNSW Press|isbn=0-86840-499-3|pages=110&ndash;112}}</ref><ref>{{cite book|title=Configuring and Troubleshooting Windows XP Professional|author=Brian Barber|year=2001|publisher=Syngress Publishing|isbn=1-928994-80-6|pages=[https://archive.org/details/isbn_9781928994800/page/285 285&ndash;389]|chapter=Configuring Internet Technologies|url=https://archive.org/details/isbn_9781928994800/page/285}}</ref>

For communities that lack adequate Internet connectivity—such as developing countries, rural areas, and prisons—offline information stores such as WiderNet's [[eGranary]] Digital Library (a collection of approximately thirty million educational resources from more than two thousand web sites and hundreds of CD-ROMs) provide offline access to information.<ref>{{Cite web|url=https://er.educause.edu/articles/2012/10/the-egranary-digital-library|title=The eGranary Digital Library|website=er.educause.edu|language=en|access-date=2020-01-08}}</ref>  More recently, the [[Internet Archive]] announced an offline server project intended to provide access to material on inexpensive servers that can be updated using USB sticks and SD cards.<ref>{{Cite web|url=https://archive.org/about/offline-archive/|title=Internet Archive: Offline Archive|website=archive.org|access-date=2020-01-08}}</ref>

===Offline storage===
Likewise, [[offline storage]] is [[computer data storage]] that has no connection to the other systems until a connection is deliberately made. Additionally, an otherwise online system that is powered down may be considered offline.

===Offline messages===
With the growing communication tools and media, the words offline and online are used very frequently. If a person is active over a messaging tool and is able to accept the messages it is termed as online message and if the person is not available and the message is left to view when the person is back, it is termed as offline message. In the same context, the person's availability is termed as online and non-availability is termed as offline.

=== File systems ===
In the context of file systems, "online" and "offline" are synonymous with "mounted" and "not mounted". For example, in [[Comparison_of_file_systems#Resize_capabilities|file systems' resizing capabilities]], "online grow" and "online shrink" respectively mean the ability to increase or decrease the space allocated to that file system without needing to unmount it.