VideoLan Client software, or VLC, can be used to watch streaming video hosted by a Universal Plug and Play server on your network. UPnP servers broadcast their availability, so opening a streamed video is simply a matter of finding it in VLC's options.
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Launch the VLC software. If it automatically suggests that you update the software, do so; you'll want VLC 2.0 or higher for best results with UPnP playback.
Select "Playlist" from the "View" menu if you are using Windows, then select "Local Network" and "Universal Plug'n'Play" to bring up a list of available UPnP servers.
Click on the "Universal Plug'n'Play" entry, if you are using Mac OS X Mavericks, in the playlist window. If a sidebar does not appear, choose "Show Sidebar" from the View menu.
Click on the server and title of the video you wish to view. It may take a minute or so for this list to update.