Minimize and Hide All Windows in Mac OS X with Command+Option+H+M. By combining the Hide All windows shortcut with the minimize keyboard shortcut in Mac OS X, you can use a third 'Minimize and Hide All' shortcut that both hides and minimizes all windows open on a Mac.
Also know, what is the shortcut to minimize all windows?
If your keyboard has a Windows key (and most current keyboards do), you can press the Windows key and the M key simultaneously to minimize all the currently open windows on your desktop. I use this shortcut frequently to eliminate desktop clutter without having to click dozens of minimize buttons in open windows.
How do you hide a window?
To click and hide, for example, you need to press and hold down CTRL + ALT and then click anywhere on a window. That program will disappear and can be bought back by using the Toggle All Windows keyboard shortcut, by right clicking on the icon in the system tray or by pressing the Clicky Gone Menu keyboard shortcut.
How do I maximize all windows at once?
Once you do that, all your open windows will get minimized to the taskbar. To restore the windows back, you will have to press Win+Shift+M. But when you minimize all open windows using this keyboard shortcut, now when you right-click on the taskbar, you will see a new context menu entry Undo minimize all windows.