www.apneaboard.com also has copies of most machine clinical manuals available for download. Some manuals have to be obtained through email. We can do our own tweaking, turn auto off/on on or off, turn alarms on or off, plus other neat things even if you don't want to change your pressure.
I find the manufacturer's web sites often have user manuals, fitting guides for masks, and technical specs. You may not be using your machine at it's greatest potential and may be able to make your treatment more comfortable by changing ramp time, rise time, flex or epr level.
I think we should all refresh our memories of the machines potential by reading these manuals (user and clinical) every now and then.