When you add a graphics card to implement Extended Display, can you still you use the preexisting port to use Extended Display

[Prerejection]

I need a graphics card to implement Extended Display because the integrated video card in the motherboard doesn't. Say I buy a graphics card that allows me to use Extended Display, but the port on the graphics card has a DVI port whereas on the tower is a VGA port. Now that the graphics card has been installed, won't the VGA port from the motherboard work?

 

[Prerejection]

Yes, you have to use the VGA port and whatever port on the graphics card to implement Extended Display. That's the whole point of buying a graphics card so you have another port to hook up your second monitor to.