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Content delivery network. (Left) Single server distribution (Right) CDN scheme of distribution Content providers such as media companies and e-commerce vendors pay CDN operators to deliver their content to their audience of end-users. In turn, a CDN pays ISPs, carriers, and network operators for hosting its servers in their data centers. Besides better performance and availability, CDNs also offload the traffic served directly from the content provider's origin infrastructure, resulting in possible cost savings for the content provider.[1] In addition, CDNs provide the content provider a degree of protection from DoS attacks by using their large distributed server infrastructure to absorb the attack traffic.

While most early CDNs served content using dedicated servers owned and operated by the CDN, there is a recent trend[2] to use a hybrid model that uses P2P technology. Operation[edit] Here content (potentially multiple copies) may exist on several servers. Technology[edit] Content networking techniques[edit] Timetoast Timelines | Create timelines, share them on the web. HordeSoftware. Horde is a free web-based groupware. The components of this groupware rest on the Horde framework. This PHP-based framework provides all the elements required for rapid web application development.

Horde offers applications such as the Horde IMP email client, a groupware package (calendar, notes, tasks, file manager), a wiki and a time and task tracking software. The Horde framework evolved from the IMP (Internet Messaging Project) webmail that Chuck Hagenbuch published on Freshmeat in 1998.[3] A constant stream of feature requests not all fitting for a webmail application led to the development of a more generic web application backbone: the Horde framework. With the release of Horde 4.0 in 2011[14] the framework saw significant architectural changes, a split into nearly a hundred separate PEAR packages[15] and support for smartphones. The Horde framework contains the following applications and application groups. Horde was the web client for the Kolab groupware system up until version 3. TheBrain - Mind Mapping Software, Brainstorming, GTD and Visual KM Software.