In Depth: OS X Yosemite tip: how to customize your Dock

The Dock has been a mainstay of OS X since the start, a place to stash apps and documents as well as easily see what's running on your Mac.Visually, the Dock has seen big changes over the years. Initially it was a semi-transparent white rectangle with subtle pinstripes, which were eradicated as of OS X 10.2 Jaguar. In OS X 10.5 Leopard, the Dock turned into a 3D glass "shelf" when at the bottom of the screen, which gradually got frosted as the operating system was upgraded further. In