Quick Access via the Dock or Taskbar
Some OS X apps can use the Dock’s pop-up menus to display application-specific information and to provide easy access to frequently used commands. For example, if you right-click iTunes’ Dock icon in Snow Leopard, you’ll get a menu that you can use to see what’s playing, to play or pause your music, to assign a rating to the current song, and to control other simple iTunes commands.
With Windows 7’s retooled taskbar, Microsoft introduces a similar feature called jump lists. Jump lists not only provide access to common commands (Windows Media Player‘s jump list has a Play command, for example), they also let you “pin” items to a specific list. For example, you can pin commonly used folders to the Windows Explorer jump list and important documents to the WordPad jump list.