DNLA/UPnP enables the DNLA/UPnP file server.
It can work fine with the media player GeeXboX for example. But also other software solutions like xbmc knows how to use this feature.
A nice setup for everyday usage,
You can also buy some nice AV Receivers that are currently on the market that supports streaming. They do not only play streams from the internet, but they can play your media from the NAS4Free server too. Receivers i did test are DENON AVR-3310/3311, AVR-4306, AVR-4308, AVR-4310, AVR-4311 and AVR-4810 series but you could also use some Onkyo's like 3008 and 5008 series. More and more receivers will get this feature now day's and lucky for us also in the cheaper lines. DENON does call this feature as example “Net Audio”, Only the Denon receivers supports full operation control by the webbrowser as an extra, something i have not seen at any Onkyo unit so far.
Click on the ‘enable’ button choose a UPnP server name, and select the interface where to enable this service. Then add the directory to share by using UPnP: