Just to be clear, the transmitter doesn't link with anything, it simply transmits the data (broadcast) and doesn't know who/what is picking up the signal. It is the computer that "marries" itself to the transmitter and use the signal sent by the transmitter for its calculations. The transmitter doesn't know anything about this "one way" relationship and thus several wrist units/computers can marry themselves to the same transmitter and pick up the signal and do their respective calculations. In short, several computers, wrist units, can work with one and the same transmitter no issues.