Yahoo! JAPAN

Online and offline LINK集

One example of a common use of these concepts is a Mail User Agent 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 off-line 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. That is, the computer itself may be online?connected to 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 connection on demand (as when an application such as Outlook attempts to make connection to a server), but the user may not wish for Outlook to trigger that call whenever it is configured to check for mail.

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 only attempts to fetch pages from servers whilst in the online 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 is offline and connection to the Internet is impossible or undesirable. The pages are either downloaded implicitly into the web browser's own 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 on-line state. One such web 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 to be "available for offline browsing". Internet Explorer will download to local 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 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.


Copyright (C) 2009-2016 Online and offline LINK集 All Rights Reserved.

薬剤師さんに夢中 リンク集1 リンク集2 リンク集3 リンク集4