Play To is a feature introduced in Windows 7 allowing anyone using a home network to send photos, music, and videos from their PC to any network-connected media device. To do this, the user needs to right-click the tracks they want to listen to, or photos/videos they want to watch, and select Play To option.
Doing this lets you enjoy your media on the player they want to use, instead of only using the PC. Devices must be compliant with the DLNA (Digital Living Network Alliance) 1.5 media standard.
Operating system terms, Play button