When did Microsoft promise you could run desktop applications on Surface RT?
Possible ways of closing a metro app
Alt f4
click the close button in the top right
right click on the task bar icon and click close
open task manager and end task it
The close button and task bar icon might only be in the latest Windows 8.1 update, but Alt f4 even works in Windows 8. Alt-f4 has been used to close windows since the 80's.
The close button has only been added since 8.1, and even then it's only visible if you hover the mouse pointer over a part of the screen. Prior to that the only way I could figure out how to close that rubbish was by grabbing the "window" at the top center of the screen, and dragging it downward entirely off the bottom of the screen. Makes sense if you're using a tablet with your finger, rubbish for use with a mouse. But just wanted to add one more way to your list, lol.
Edit - Ctrl+W might work, also? It closes windows, haven't tried it in Metro yet.
