OK, you all already knwo I knwo nothing about video games, so tell me what a DC port is.
A port is a nearly identical game being placed on a different console.
By "porting" a company takes the original source code they had that they used to program the first game and optimize it to work on a different hardware platform.
It's a standard practice in the industry because the majority of the cost incurred in the development process of a videogame is in the creation of the original source code. If they then make minor changes to make it work with another hardware platform, they give themselves access to an entirely different userbase.
Does the Dreamcast hook up the same as a Playstation?
Yes, it does.
I think they can switch back and forth with out much trouble., because they have new TVs with front jacks.. I bought them a bit before Christmas.
You could also just get a simple, cheap switchbox that are available at most videogame stores (around 20 dollars), which allows you to hook the switchbox up to the TV, and then hook the game systems up to the switchbox. This allows you to have 4+ game consoles always hooked up to your TV, and you can switch between the consoles by a simple press of a button on the switchbox.