[Emperor Rozenski]

Maybe it works like when you cut and paste a file on the same drive, it physically stays in the same place on the disk, so is the same file, but the index changes makes it appear to be in a different place. Maybe something similar with other dimensions would apply here, e.g. we actually exist in a different dimension only to be 'rendered' in this one we percieve around us and teleportation only alters the 'rendering'?

Although the method outlined by Nod sounds more like cutting and pasting a file to a new drive, murdering the original file and creating an exact copy in it's place elsewhere!