More info about FBI's bug of mafios keyboard?

A few months ago, it was revealed that the FBI broke into some mafiosos house and installed some keysniffing software on his computer, because he was using PGP. Apparently the software was very hlpeful to the prosecution in the trial. Does anyone have any more technical info about this? How did they physically get in? What kind of software did they use? How do they get the data which the software collects? Curious. Thanks