If your client is a Mac, you may have to select “All Games” to see the game you want to stream rather than the default selector of “Mac” (which hides all the Windows games, of course, even if you can stream them - probably a bug that will be fixed). To play a game over Steam’s In-Home Streaming, just load up the game library on the client, click the game you want to stream, and then select “Stream” from the little drop down menu (see right).
