So in a simple way of saying it its like a web address then by simply changing a small portion like".com" to ".org" [or something] the location changes.

__________________

I don't watch Stargate myself but from what i've seen of it (which is trailers) it works the same way.

When its acitive it can lead you to another world or place, when its not active its just like walking through a large hole, same with the doors when they are active they take you to the Merovingians Castle or whatever the door goes, when they are not active they work like normal doors leading you from one room to another

Well with the Stargate (watched it sometimes) they have a ring and put a "code" in. When the code is right they travel to different dimensions. If not active it is a hole. So yeah mostly.

The key is the "code changer" and the "hole" is the door.

__________________

Exactly the Key changes the door making it a portal to a different place in the Matrix, i do wonder though does that mean ever single door in the Matrix leads to a hidden door?