Hi Milija,
You can use TC as a genereal purpose network share. You need to enable it under the Apple Airport utility.
You will need a seperate UPnP Media server (Minimserver, Asset, Twonky etc) running on a computer elsewhere however.
The machine that is running your UPnP media server will need to mount the TC data share (as per the label you gave it in the Airport utility) over your LAN. The TC network share should appear as a SMB or AFP network share. Best use AFP as there are reports of Apple's implementation of SMB being slightly problematic.
You will need the access credentials you setup in the Airport utility.
However despite all this, I would not recommend it.. and I understand Apple don't recommend the TC as a genereal purpose NAS either. The reason? The TC is designed for background incremental backups, and the occasional restore. It's performance is probably too low to comfortably use it for general purpose NAS duties. You may find it becomes a throughput bottleneck.
I would recommend using a purpose designed NAS for network storage if this is what you want to do.. Further many of these consumer NAS's now have an OS and enough CPU power and memory to support a third party UPnP media server directly without needing another computer.
I use my TC as a backup store, dual band / 802.11ac wifi access point and internet router. It does all three very well, and the TC restore capability has saved a lot of grief a couple of times. I have set it up to also support a share, but only occasionally use it as such if I need some sort of local drop box facility, where for what ever reason my main NAS's are not appropriate.
Simon
