1 If you are looking for additional information on error messages (1 - 21999)?? browse the BOL Contents as follows:
Error Message Descriptions:
Resolving System Error Messages:
Errors 1 - 999
Errors 21000 - 21999
2 If interested in c2 audit mode there are MS white papers pertaining to the subject.
3 If interested in auditing using profiler or traces there is some information on both in BOL and there are MS resources pertaining to both subjects, (however not all trace flags or results are documented to users).
(Unfortunatly, reference links for 2 & 3 have been moved.)