A task switcher for Windows.
Alt-1, Alt-2, ..., Alt-9 for fast window switch. Alt-J, Alt-K for Alt-Tab / Alt-Shift-Tab Alt-Shift-1, ..., Alt-Shift-9 for pinning window to position 1-9. Ctrl-Alt for invoking switcher panel, then Ctrl-Alt Q W E R A S D F for switch.