Teleporters are actually launchpads with modified code. This is a example of a launchpad's code: 2^384,324,0,-1. The 2 represents that it is a launchpad. The 384,324 are its x,y coordinates, and finally the 0,-1 are its velocity. Changing these numbers makes the launchpad more or less powerful.
This map, minerva, is a fine example of how teleporters are used.