By Desktops I assume you mean the Mission Control extensions. Well with the new Mac OS X Mavericks, you can have seperate "desktops" per monitor. Connect your monitor and open System Preferences>Displays>Arrangment. Uncheck the box that says Mirror Displays. Now position the two monitors where you want them to "relatively" connect to each other. Drag the Netflix screen over to the monitor based on where you "arranged" them.