Why on earth would you do this when you can use the cardreader on you PC and free open-source software like Sleepyhead? http://sourceforge.net/projects/sleepyhead/
Because, ghashley, this thread was started in 2009 which was prior to the release of the PR SystemOne series of PAP devices. The Respironics series of PAPs prior to the S1s required a proprietary card reader and entirely different data card in addition to which SleepyHead wasn't even in existence.
Also, Sleepyhead is BETA software. it has not even reached version 1. So being BETA software, it is much more likely to have bugs and will need the user to be diligent about loading updates. There probably is something to be said about using the Respronics software as it will provide the info in the same way that your doctor gets it.
That said, I like what SleepyHead is doing, and support for consumers using the Respronics product is pretty poor. I have both, I could take a look at what each provides and see if there are any major differences.