I stand by "Practical Pistol Course" as the ORIGINAL term described by Paul B. Weston, who was an active shooter in the '30s and saw it developed. It got to the standard 1500 format in 1959. But William C. Joyner, the 1970 champion, called it the "Practical Police Course." NRA runs most of it now and calls it "Police Pistol Combat" and admits only law enforcement officers.
Th Ohio organization has CoF descriptions and illustrations at:
http://www.geocities.com/Colosseum/Arena/2351/index.html
NRA will sell you a rule book for $2.50 but does not have it online.
There are several different events for different guns. Match (heavy barrels, ribs, three-position sights, etc.), Distinguished (factory barrel and sights), and Service (fixed sights). with separate events for revolvers and autos. At the Nationals there will also be a Duty gun match, with guns and ammo issued on the firing line. Tradtitionally those are 4" fixed sight .38s.
My PPC contact says you would need to take six guns to enter all major events at the Nationals these days. He shoots a Schmitt heavy barreled S&W M10, an M52, an M14, an M581, a Ruger 95, and is looking for a Distinguished auto to replace his Gold Cup because he cannot make it or any 1911 shoot.
Big matches will have a riot gun event, and backup gun sidematches, too.