Well, this was what I thought I wanted, so I ticked it, and restarted.
It did exactly what it says.
It opened no UI whatsoever!
So how do I make a call, open a chat, add a contact, or get the window back?
I eventually resorted to killing the process, and hacking the xml to 'untick' the box.
I'd quite like it to run windowless in the background (so I'm available if anyone wants to call me), but obviously I need a button or something to click when I want to place a call.
Am I missing something obvious??
I'd also like skype video, which I expect will be closely followed by free beer, ferrari, ...
Chris