http://www.autohotkey.com/docs/commands/WinMove.htm

    Almost all of the windowing commands can be told to operate upon the active window by specifying
    the letter A as the WinTitle parameter and omitting WinText, ExcludeTitle, and ExcludeText. In
    the following example, Win+UpArrow becomes a hotkey to maximize the active window:
    #Up::WinMaximize, A