Parallels Desktop works better than ever (pictures)
With the latest version of Parallels desktop, you can switch between operating systems and even use system services from your Mac in a Windows environment.

Parallels Desktop 10 for Mac
Whether you need to run different operating systems at work or at home, Parallels Desktop makes it easier than ever to seamlessly switch between them.
Swipe between operating systems
Once you're up and running, you can run Windows in full-screen, allowing you to three-finger swipe between operating systems.
Desktop control
Use the Parallels Desktop Control Manager to manage your installed operating systems. You can also click the gear icon to configure your system to your liking.
Optimize your install
While setting up, you can configure your installation depending on what you're going to use it for.
Choosing Mac sources
In this Documents window from Windows 8.1, you can see how Parallels adds places to save via your Mac. Over in the left column, you have options for Dropbox, iCloud, or Photo Stream so you can save files to those locations.
Using Mac specific services
While working from Windows 8.1, you can right-click a file in your Documents folder, and you'll see Mac-specific options in the contextual menu.
Drag and drop to a virtual computer
When running in what Parallels calls Coherence mode, you can drag and drop a file that was sitting on your Mac desktop directly into an email you're composing in the Windows environment.