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 been provided at a different location.
The new Show Desktop located on the bottom right of the task bar, it’s not an icon any more, instead now its a little bar that is glowing next to the Time/Date.
There are 3 type of actions it can perform according to event performed.
1. Mouse Hover : Show desktop & would bring back all Windows back when mouse is taken away ie a preview of Desktop and see through all Running Appz on your 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 Windows 7 as well.