Nokia Play To is designed to ease the process of playing media stored on your mobile through remote devices. Once you have opened the application, choose which device to connect to, and then choose the photo, video or music file to play. In most cases the media will appear within in a few seconds on your chosen device (longer times are possible, depending on the size of the file and the speed of your wireless network).
We tested this with a Windows PC and found audio and images were played in around one second, with videos taking around three seconds. Similar results were observed on a Sony TV. Once a media item has begun playing, you can use the Nokia Play To application to find the next media item, while the first is played in the background.
You can also browse the files on your phone from a DLNA control point (player). In this instance, the UI will be controlled by the playback device, rather than the phone. In order to do this you will need to turn on the DLNA server in your phone, by going to Settings->Connectivity->Media Server.
DLNA compliant devices are more common that you may realise. For example Windows Media Player 11+ supports DLNA (you may need to enable this setting), which means any Windows PC can be used with Nokia Play To. In addition, many recent TVs and Blu-Ray players have this functionality built in. Also, the Xbox and PlayStation entertainment consoles also support the DLNA standard
[Via - All About Symbian]