Can I use a NAS with iTunes?

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The DLNA technology standard offered by Digital Living Network Alliance that enables you to easily stream music and video to a stereo or HDTV, print photos from a camera, and transfer files to a mobile device. In order to serve files to other devices, both the NAS and the device that will be receiving the file (either as a stream or as a download) must be DLNA Certified Products.

With Universal Plug and Play (UPnP), devices that are connected to the same network can automatically detect one another for easy sharing of files. A NAS with a UPnP server can easily connect with and stream multimedia to other UPnP-enabled devices, such as game consoles.

While the Wi-Fi-enabled Time Capsule provides a central location for backups for all the Macs in your home, it's technically not a NAS device as it only provides backup and recovery functionality. You can't use it to stream media (i.e., via an iTunes server) or access files remotely.