You can use the Windows Phone 7 Emulator to run Windows Phone 7 applications on your development machine. If you've installed the Windows Phone Development Tools, you should be able to access the emulator by clicking the Start button and then All Programs │ Windows Phone Developer │ Tools Windows Phone 7 Emulator. When you debug a Windows Phone application, it should appear displayed in the Windows Phone 7 Emulator application by default.
The menu below the screen includes the Back, Start, and Search buttons. The menu displayed at the right of the screen in the image above, includes the Close, Minimize, Rotate Right, Rotate Left, Expand, and Zoom buttons. While the emulator is not a perfect representation of the touch interaction possible with the Windows Phone, it works well to test and debug Windows Phone applications.