Years ago, Macs and Windows machines had a hard time reading the same floppy discs; now you can run Windows on a Mac, from within Mac OS X itself! This tutorial on Lifehacker explains how to make application windows within Windows XP run seemlessly inside OS X.

It relies on the new Coherence option within the latest Parallels beta, the excellent software that allows you to run Windows within OS X. It's something of a hack, because while Coherence allows you to run Windows programs along side your Mac ones, you still need to hide the Windows task bar and sync your OS desktops to create the "seemless" appearance.