[ Thanks to James Maguire for this link. ]
No feature defines the KDE 4 release series more than
Activities. At the same time, no feature is so little understood —
Fedora even has a package for removing the desktop toolkit, which
provides mouse access to Activities.But, when you take the time to learn about Activities, you’ll
find them a natural extension of the desktop metaphor that just
might help you to work more efficiently.