PCR and DirectPCR
At the heart of the TimeTrax controversy was the XM PCR: a computer-controlled XM Receiver. Unlike the other receivers, which could be used in the car or home stereo, the XM PCR required a computer to run. A software application on the computer acted as the radio's controls and display, which led to a flurry of third party developers, who wanted to make a PCR replacement. Many of them received Cease and Desist letters from the XM company. Once the PCR was discontinued, for the reasons listed above, people found that the XM Direct, a receiver intended to be used in satellite-ready car stereos, can be connected to a computer with a very simple adapter cable. Some people have dubbed the entire kit, with receiver, cable, and software, the Direct PCR. While the original PCR software does not control the XM Direct receiver, several community developers have continued to develop PCR replacement software.
Read more about this topic: XM Satellite Radio