<p>I've been hearing a lot about about how the new version of VMWare Fusion can run virtual operating systems in "headless mode". </p>

<p>A Google search makes it clear that other virtualisation products also have similar features, however, I have not been able to find a good description of what this actually means? What is happening when you do this?</p>

For anyone that is interested, you can activate headless mode in VMWare Fusion by running the following command in Terminal.app
```
```
defaults write com.vmware.fusion fluxCapacitor -bool YES
```
```