the process works by changing the energy state of matter and transferring it through subspace a sub-dimension so it's kind of a dimensional travel device, I agree that you probably need one at both ends for it to work, but then again if the control is in the beaming process the beam frequency then it may be possible that only one end requires it, also depends on how long something can remain in subspace maybe only a very short time in a realistic sense maybe less then a second if it's anything like creating a micro black hole.