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Show desktop in Quick Launch till Windows Vista was a handy feature
which was used to minimize all the open Windows. New users would find
this feature not present at the same place in Windows 7 instead it has bee
provided at a different location.This feature has been named as Aero Pee
The new Show Desktop located on the bottom right of the task bar, it
not an icon, and instead it‟s a little bar now that is next to the Time/Date.
There are 3 types of actions it can perform according to event performed.
原帖地�: TechSpott - Computer and technology forums http://www.techspott.com//showthread.php?p=231
1. Mouse Hover: Show desktop & would bring back all Windows back
when mouse is taken away i.e. a preview of Desktop and see through all
Running Appz on your Desktop. Use Win+Spacebar to peek to desktop.
2. Mouse Click: Minimize all Windows and show Desktop
3. Mouse Re-Click: Open all Windows again after they have been
minimized by first Mouse Click.

This function can be achieved by pressing Win+D or Win+M Key combos
to bring you to the Desktop. Also Quick Launch can be enabled in Window
7 as well.