A download manager is a computer program dedicated to the task of downloading (and sometime uploading) possibly unrelated stand-alone files from (and sometime Opera Portable Download to) the Internet for storage. This is unlike a World Wide Web browser, which is mainly intended to browse web pages, composed of Gsxr Manual Download a multitude of smaller files, where error-free moving of files for permanent storage is of secondary importance. (A Opera Portable Download failed or incomplete web Opera Portable Download page file rarely ruins the page.) The typical download Opera Portable Download manager Dragonslair Download at a minimum provides means to recover from errors without losing the work already completed, and can Opera Portable Download optionally split the file to be downloaded (or uploaded) into 2 or more segments, which are then moved in Opera Portable Download parallel, potentially making the process Opera Portable Download faster within the limits of the available bandwidth. (A few servers Opera Portable Download are known to block moving files in parallel segments, on Opera Portable Download the principle that server capacity should be shared equally by all users.) Multi-source is Opera Portable Download the name given to files that are downloaded in parallel.
There are several things that some Download Free Modern Short Stories web browsers are not very good at. That's where Opera Portable Download the download managers enter the Opera Portable Download equation:
Pausing the downloading of large Free Download Battletech Manual files.
Resuming broken or paused downloads (especially for very large files).
Downloading files on poor connections.
Downloading several files from a site automatically according to simple rules (file types, updated files, etc. - see also Offline Browser).
Automatic recursive Opera Portable Download downloads (mirroring).
Scheduled downloads (including, automatic hang-up and shutdown).
Searching for mirror sites, and Opera Portable Download the handling of different connections to download the same Opera Portable Download file more quickly (segmented Opera Portable Download downloading).
Download managers are useful for active Internet users. For dial-up users, they can automatically dial the Boa My Prayer Mp3 Download internet service Opera Portable Download provider at night, when rates or tariffs are usually lower, download the specified files, and Opera Portable Download hang-up. They can record which links the Opera Portable Download user clicks on during the day, and queue these files for later download. Opera Portable Download For broadband users, download managers can help download very large files by resuming broken downloads, by limiting the bandwidth used, so that other internet activities are not Opera Portable Download affected (slowed) and the server is not overloaded, or by automatically navigating a site and Opera Portable Download downloading pre-specified content (photo Opera Portable Download galleries, MP3 collections, etc.) this can also include automatically downloading whole sites and regularly updating them (see Opera Portable Download Mirroring).
Many download managers support Metalink, an XML file listing mirrors, checksums, and other information useful for downloading.
See below for some examples of commonly used download managers. Opera Portable Download Some Auto Woodcutter Download downloaders are optimized Opera Portable Download for a certain function. For example, Opera Portable Download Offline Explorer is designed to download entire websites.
Download managers, such as Go!Zilla, were among Opera Portable Download the first Opera Portable Download adware applications Opera Portable Download displaying a banner Opera Portable Download ad in the user interface.
Related to download managers are two other breeds of Internet programs, file-sharing peer-to-peer applications (Kazaa, eMule, BitTorrent, Gnutella) and stream recorders (such as StreamBox VCR).
While download managers are designed to give users Opera Portable Download greater control over downloads, some downloaders are created to give that control to content distributors instead. Some software companies, for example Opera Portable Download Adobe [1], provide such downloaders for downloading software on their own Opera Portable Download site. Presumably Opera Portable Download this increases reliability and reduces tech support costs Opera Portable Download to them. A possible reason is increasing the control over redistribution of their software (even when the software is freeware).In Opera Portable Download computer technology and telecommunication, on-line and off-line are defined by Federal Standard 1037C. They are states or conditions of a "device or equipment" or of "a Opera Portable Download functional unit". To be considered on-line, a device Sex Manga Download must be at least one of:
"Under the direct control of Opera Portable Download another Opera Portable Download device"
"Under the direct control of Opera Portable Download the system with which it Opera Portable Download is associated"
"Available for immediate use on demand by the system without human intervention"
"Connected Opera Portable Download to a system, Opera Portable Download and is in operation"
"Functional and ready for service"
while a device that is off-line is not (e.g. it has "its main power source disconnected Opera Portable Download or turned off", and is "off-power").
One example Opera Portable Download of a common use of these concepts is Opera Portable Download a Mail User Agent that can be instructed to be Opera Portable Download in either Opera Portable Download "on-line" or "off-line" Opera Portable Download states. One such MUA is Microsoft Outlook. When it is "on-line" it will attempt to connect to mail servers (to check Opera Portable Download for new mail at regular intervals, for example), and when it is "off-line" it will not attempt to make any such connections. The "on-line" or "off-line" state of the MUA does not necessarily reflect the connection status between the computer on which it is running and Internet. The user may Opera Portable Download have the computer itself on-line, connected to Internet via a cable modem or an ADSL connection, but may wish for Outlook to be off-line, Opera Portable Download so that it makes Opera Portable Download no attempt to Opera Portable Download send or to receive messages. Or the computer may be configured to employ a dial-up connection on Opera Portable Download demand (whenever an application such as Outlook attempts Opera Portable Download to make connection Opera Portable Download to a server), Opera Portable Download but the connection may be an expensive telephone call from the particular location in which the computer currently Opera Portable Download happens Opera Portable Download to be (such as a hotel room) and the user may not wish Outlook to trigger making that call every 5 or 10 minutes to check Opera Portable Download for mail.[1]
Another example of the use of these concepts is in the world of digital audio technology. A tape recorder, digital Opera Portable Download editor, or other Opera Portable Download device that is "on-line" is Opera Portable Download one whose clock is under the control of Opera Portable Download the clock of a "synchronization master" device. When the sync master commences playback, the "on-line" device automatically synchronizes itself to the master and commences playing from the same point in the recording. Whereas a device that is "off-line" Opera Portable Download uses no external clock reference Opera Portable Download and relies upon its own internal clock. When a large number Canasta Card Game Free Download of Celebrity Jeopardy Download Free devices are connected to a sync master, it is often convenient, if one wants to hear just the output of one single Opera Portable Download device, to take it off-line, because if the device is played back on-line all synchronized devices have to Opera Portable Download locate the playback Opera Portable Download point and wait for each other to be in synchronization.[2] (For further related discussion, see Opera Portable Download MIDI timecode, word sync, and recording system synchronization.)
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A third example of a common Opera Portable Download use of these concepts is a web browser that Opera Portable Download can be instructed to be Opera Portable Download in Opera Portable Download either Opera Portable Download "on-line" or "off-line" states. The browser Opera Portable Download only attempts to fetch Opera Portable Download pages from servers whilst in the "on-line" Opera Portable Download state. In the "off-line" state, users can perform offline browsing, where pages can be browsed using local copies of those pages that have previously been downloaded whilst in the "on-line" state. This can be useful when the computer Opera Portable Download itself is also off-line, with connection to Internet expensive or Opera Portable Download impossible. The pages are either downloaded implicitly into the Opera Portable Download web browser's own cache, Opera Portable Download as a result of prior on-line browsing by the user, or Opera Portable Download explicitly by the browser Opera Portable Download being configured to Opera Portable Download keep local copies of certain web pages, which Opera Portable Download it keeps updated when the browser is in the on-line Opera Portable Download state, Opera Portable Download either by checking that the local Opera Portable Download copies are up-to-date at regular intervals or by checking that the Opera Portable Download local copies are Opera Portable Download up-to-date whenever the browser is switched Opera Portable Download to the on-line state. One such web Opera Portable Download browser capable of being explicitly configured to download pages for offline browsing is Internet Explorer. When pages are added to the "Favourites" list, they can be marked for being made "available for offline browsing". Internet Explorer will download to local Opera Portable Download copies 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 Opera Portable Download of local disc space allowed to be consumed, and the schedule on which local copies Opera Portable Download are checked to see whether they are up-to-date, are Opera Portable Download configurable for each individual "Favourite" entry.
See also:
Offline browsing known as "Offline favourites" was removed as a feature in Opera Portable Download the most recent version of Internet Explorer Opera Portable Download 7, which Opera Portable Download only now supports single web page saving, but not browsing or storing an Opera Portable Download entire site offline.[citation needed]
Similarly, off-line storage is computer storage that is not "available for immediate use on demand by the system without human intervention", i.e it is storage that is off-line.
The ideas of "on-line" and "off-line" have been generalized from computing and Opera Portable Download telecommunication into Opera Portable Download the field of human interpersonal relationships. The distinction between what is considered "on-line" and what is considered "off-line" has become a subject of study in the field of sociology.[7]
The Opera Portable Download distinction between "on-line" and Opera Portable Download "off-line" is conventionally seen Opera Portable Download as the distinction Opera Portable Download between computer-mediated communication and face-to-face communication (e.g. face time), respectively. "On-line" is virtuality, and "off-line" is Opera Portable Download reality (e.g. real life or meatspace). Slater states that this distinction is "obviously Opera Portable Download far too simple". To support his argument that the distinctions in relationships are more Opera Portable Download complex than a simple "on-line"/"off-line" dichotomy, he observes that some people draw no distinction between an "on-line" relationship, such as indulging in cybersex, and an "off-line" relationship, such as being pen-pals. He also argues that even the telephone can be regarded as Opera Portable Download an "on-line" experience in Opera Portable Download some circumstances, and that the blurring of the distinctions between the uses of various technologies (such as PDA and mobile telephone, television and Internet, and telephone Opera Portable Download and Opera Portable Download voice-over-IP) has made it "impossible to use the term 'on-line' meaningfully in the sense that was employed by the first generation of Internet research".[7]
Slater asserts that there are legal and regulatory pressures to reduce the distinction between "on-line" and "off-line", with Opera Portable Download a "general tendency to assimilate online Opera Portable Download to offline and erase the distinction", stressing, however, that this does not mean that on-line Opera Portable Download relationships are being reduced to pre-existing Opera Portable Download off-line relationships. He conjectures Opera Portable Download that greater legal status may be assigned to on-line relationships (pointing out Opera Portable Download that contractual relationships, such as business transactions, on-line are already seen as just as "real" as their off-line counterparts), although he states it to be hard to imagine courts awarding palimony to people who have had a purely on-line sexual relationship. Opera Portable Download He also conjectures that an "on-line"/"off-line" distinction may be seen by people as "rather quaint and not Opera Portable Download quite comprehensible" within 10 years.[7]
The Opera Portable Download distinction where "on-line" is seen as virtuality and Opera Portable Download "off-line" as reality is sometimes inverted, with "on-line" Opera Portable Download concepts being used to define and Opera Portable Download to explain "off-line" activities, rather than (as per the conventions of the desktop metaphor with Opera Portable Download its desktops, trash cans, folders, and so forth) the other Opera Portable Download way around. Several cartoons by The New Yorker have satirized this. Opera Portable Download One includes Saint Peter asking for a Opera Portable Download user name and a password before admitting Opera Portable Download a man Opera Portable Download into Opera Portable Download Heaven. Opera Portable Download Another illustrates Opera Portable Download "the off-line store" where "All items are actual size!", where shoppers may "Take it home as soon as you pay for it!", and where Opera Portable Download "Merchandise may be Opera Portable Download handled prior to purchase!". Opera Portable Download |
