Exceptions to the restrictions faced by Windows Store apps are given to web browsers. The user's default browser can distribute a Metro-style web browser in same package as the desktop version, which has access to functionality unavailable to other apps, such as being <answer>able to permanently run in the background, use multiple background processes, and use Windows API code</answer> instead of WinRT (allowing for code to be re-used with the desktop version, while still taking advantage of features available to Windows Store apps, such as charms). Microsoft advertises this exception privilege "New experience enabled" (formerly "Metro-style enabled").
What different options did the desktop version have?
able to permanently run in the background, use multiple background processes, and use Windows API code