Alter cmd-tab behaviour on OSX to group Parallels applications? When running a Parallels virtual machine (i.e. Windows 7), cmd-tab behaves as the Parallels icon showing the list of virtual machines (which can be closed) and a separate icon for each open Windows application.

It would improve my productivity for Windows to appear as a single icon that just switches to whatever is open on my Windows VM. How do I do this?

I am running OSX 10.9 and Parallels 9.
You must deselect the "Share Windows applications with Mac" option in the Applications pane of your VM's configuration.