WinToggle between Desktop and Start Screen (or open Apps)
Ctrl+Tab On Start Screen:   Switch Between Start Window and All Apps Window
Win, then Ctrl+Tab Open All Apps Window
Win, then start typing App Name Search and execute Apps
Escape                          Close Start Screen and go to Desktop
Win+E                              Run Explorer on Desktop
Win+R                          Execute Run on Desktop
Win+X                          Open Power User Commands on Desktop
Alt+F4                          Shutdown Windows
Win+L                          Lock Computer
Win+F1                         Open Windows Help