lctb51, on 15 March 2013 - 01:00, said:
When I was first introduced to windows 8, I wondered how Metro would not eat more memory. So metro is apart of the Windows system. So, does Metro work in the same way as when you hit al ctrl delete in vista and beyond?
While I'm not sure how Metro apps are represented in the system, I can say for certain that Windows is not instantiating a 'new desktop' like the Ctrl+Alt+Del Secure Desktop. You'll notice it doesn't flicker when going in and out of the Start Menu like it does if a UAC prompt (on the Secure Desktop) comes up.
If I were to guess, everything is still tied to explorer.exe and the Desktop Window Manager. You'll notice that if you kill that process, all Charms Bars, start screen, taskbars disappear. So I'm guessing they just rewrote explorer.exe to show the Start 'menu' first and the desktop later, Metro apps are Windows apps that use WinRT (as opposed to Win32) that draws to fullscreen Direct2D surfaces represented inside the Desktop Window Manager, like every other window.