Mac OS X Snow Leopard: The Missing Manual (Missing Manuals)

D.53. Minimize button

You can minimize a Mac OS X window to the Dock, just the way you would minimize a Windows window to the taskbar. You do so by double-clicking its title bar, pressing c-M, choosing Window Minimize Window, or clicking the yellow Minimize button at the top left of a window. (Restore the window by clicking its icon in the Dock.)