Is the Linux desktop ready for mainstream users? The developers behind the latest KDE Linux desktop release would probably say yes, that it lives up to the promise of the first KDE 4.0 release a year ago. KDE 4.2 is the second major point release for the KDE 4.x desktop. Its codename, "The Answer," also telegraphs its goals. It builds on features first revealed in KDE 4.0 with an improved Plasma desktop interface and KWin window management.