Can USB act as a video output??

*As far as I am aware:*
you are able to utilize USB ports as video outputs.
With a basic graphics card you can only output either:
2 separate signals for split screen from the 2 standard dvi provided outputs.
OR
2 separate signals for split screen from the 2 USB ports.
NOT BOTH providing 4 outputs.
QUESTION
Does the USB port output video via the 2 graphics cards...thus providing only 2 outputs?
What are the ins and outs of dual layering graphics cards to provide further video output options?
is this expensive? does it require a new graphics cards? can i just add a further graphics card to provide 3 output for an extended screen display??
I hope I have provided enough food for thought.....Im very confused with how this all works
Any advice, help or 'know how' will be very appreciated..

To clarify..
Im looking to extend my split screen arrangement to a further screen. making a 3 screen set-up.
Cheap is the key word.....thus utilizing USB...... this seemed to be a good answer
thanks for your time

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