How to prefer a monitor over the other in a dual monitor setup (but with 3 monitors)

[zedeedisdone]

I have an All-in-one PC with a HDMI and VGA port.
This HD Graphics 4400 seems to only be able to run 2 monitors at a time.

Right now what happens is, both the built-in monitor and VGA monitor work at a time.
I want to be able to prefer using the HDMI TV over the VGA monitor whenever I power the HDMI TV on.

So ideally what I want, is the HDMI and built-in to work when the TV is on, and at the same time turn off the VGA monitor signal..
I can do this by just removing the VGA port, but there has to be an easier way.

[Levent]

I dont think you can achieve that easily with software (Although it should be possible with some powershell script I got no clue how that can be done). If your monitor also has a HDMI port, you can get a HDMI switch.