PB = PunkBuster
"In general, GUID is an acronym that stands for "Globally Unique Identifier". The GUID inside PunkBuster is used to identify players with something more solid than their playing name or IP address. Your guid is loosely based on the CD key that was used to install the game on your computer."
Regarding CheatDetector, stats padding can get you banned, if it makes your stats look like a cheat has been used (because they are not normally reachable).
"Stat padding is the act of recieving undeserved points due to abnormal and unhelpful gameplay."
Different families of cheats have distinct violation numbers:
"When PunkBuster detects a cheat or hack by repeated positive identification on a player's computer, a violation is raised. These violation numbers are 50000 and higher."
"There is a whole category of kicks by PunkBuster known as Restriction kicks. These are not meant to be treated as cheat violations. These kicks are reserved for programs, drivers, etc. that contain methods not generally allowed on PunkBuster servers. We encourage admins to never ban for Restriction kicks."
"HTTP cookies (also called web cookies, Internet cookies, browser cookies, or simply cookies) are small blocks of data created by a web server while a user is browsing a website and placed on the user's computer or other device by the user's web browser. Cookies are placed on the device used to access a website, and more than one cookie may be placed on a user's device during a session."