Some windows key tricks...

[Windows] + [D]  Show or Hide the desktop
[Windows] + [Home]  Minimize all but selected window. Reverse by clicking the key combination again.
[Windows] + [Spacebar]  Make all open windows transparent to view gadgets and icons on desktop.
[Windows] + left arrow OR [Windows] + right arrow  Dock selected window to the left or right half of your screen.
[Windows] + up arrow OR [Windows] + down arrow  Maximized and restores the selected window.
[Windows] + [Tab]  Launch 3D representation of open windows and click [Tab] key again to flip through them.
[Windows] + [B]  Puts focus on the ‘show hidden icons’ button on the system tray.
[Windows] + [1] To [Windows] + [9]  Launch first through ninth icon on taskbar, including items pinned to taskbar.
[Windows] + [SHIFT] + [1] To [Windows] + [SHIFT] + [9]  Starts new instance of respective taskbar icon.
[Windows] + [Alt] + [1] To [Windows] + [Alt] + [9]  Opens jump list for respective icon.
[Windows] + [T] OR [Windows] + [SHIFT] + [T]  Move focus to front or back of taskbar.
[Alt] + [Ctrl] + [Tab] + left/right/up/down arrow  Flip window.
[Alt] + [Tab]  Cycle through open windows.
[Windows] + [P]  Select the Projector Mode
[Windows] + [+] OR [Windows] + [-]  Activates Windows Magnifier to zoom in or out of screen.
[Ctrl] + [Alt] + [D]  Switch to docked mode.
Ctrl] + [Alt] + [L]  Switch to lense mode.
[Ctrl] + [Alt] + [F]  Switch from docked or lens mode back to full screen mode.
[Ctrl] + [Alt] + [I]  Invert colors.
[Windows] + [Esc]  Exist magnifier views.
[Windows] + [G]  Cycle through desktop gadgets.
[Windows] + [X]  Launches Windows Mobility Center.