It's just one of dozens of ways of getting media from something to something potentially via something else. Somebody above mentioned using a NAS (Network Attached Storage device) which has their media on it and (I'm assuming) using a XBMC client on their N10.1-14 to access that content. They could potentially then stream that content being received by their N10.1-14 on to something else (EG: TV). There's a ton of ways of accessing and presenting content and XBMC is just one of many.
I use Plex which does pretty much the same thing but supports my smart TVs (Samsung, Google TV) natively so I don't need a device in between. When I'm traveling I use my trusty old AllShare Cast dongle. I have a Windows Home Server vs. a NAS and run PlayOn on it in addition to Plex server. PlayOn provides access to a ton of web content (including Amazon Instant without needing Flash) in addition to integrating VLC to playback content on my server. PlayOn uses the stock video app which means I can use pop-up-play, multi window, and Smart pause. When I'm working on office stuff I'll usually have a movie, TV show, or the live news running in a pop-up window to keep myself amused.
Here's some screen shots. The first three are PlayOn with AIV or Hulu playing; the second two are Plex. Both support Chromecast but I don't use it. With so many ways of doing the same thing there's no right or wrong solution.
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So it's a screen cast? I use my ps3 to watch movies and TV sites from my tracker as a media server but can't play like nesdroid or anything... Sort if I'm way off here...
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