Did your DisplayLink adapter connect to the Mac, or to the Win8 Virtual Machine? You should be able to check your Mac display settings to see how many displays it thinks are connected.
Sounds like it connected to Windows, automatically installed the drivers from flash, then just came up as a seperate display for the VM. You could also look in Windows device manager (or whatever it might be called now) and see if Windows sees the DL adapter as a USB device.
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