The other day I was sitting at a computer and I hit Command-Tab to shift between applications. Someone from the Windows side of the fence was peeking over my shoulder and was astonished that Mac OS X had that functionality. So I went on to show what else Command-Tab can do. For example, press Command-Tab and hold the Command key and you’ll keep the Application Picker window open. Then press the Tab key again and it will move to the next application or continue pressing it and it will cycle through all of the open applications until coming back to your current application. Press the Command-Shift-Tab and it will back…