Before Windows 7, media streaming features were focused on media enthusiasts. To improve the setup experience, media streaming has been integrated with the new HomeGroup feature so in a typical home network configuration, media streaming is enabled and works by default. There is also a new “Stream” menu prominently displayed in the Window Media Player user interface (see figure below) that exposes simple scenario-based configuration options. These options allow you to: Set up your home PC so you can access your media libraries while away from home; Allow other Windows 7 PCs and devices to push media to your Player and control it; Quickly authorize all home PCs and devices to access your media collection

Full Article: E7 Blog