NOTE! As of build 9523 the Bookmark tag has been deprecated and has been replaced with the 'Source' tag.
The Bookmark tag will function for the foreseeable future, but the documentation will be moved to the new 'Source' tag.
Media Sources are the links to the shares that you see when you first enter Programs, Videos, Music, Pictures or the Filemanager. They can be as simple as a link to a folder on the local loaded hard drive to network shares that are shares on another computer, even online-radio-stations and streams are available as media sources.
This section will explain how these work.