This week I'll give you a couple of keyboard shortcuts for manipulating the application window.

Alt+F4 will close
Alt+Spacebar+C will close
Alt+Spacebar+N will minimize the window to the Start Bar
Alt+Spacebar+X will maximize the window
Alt+W+O will close the current drawing
Alt+W+L will close all open drawings
Alt+F+C will close the current drawing
Ctrl+Q  will exit the current drawing session
Ctrl+Alt+Del will open the Windows Task Manager and allow you to select your AutoCAD application