The RACROUTE REQUEST=VERIFY, REQUEST=AUTH, and REQUEST=DEFINE macros perform user verification, access checking, and resource definition, respectively. Preprocessing installation exits are available to tailor the parameters specified by the REQUEST=VERIFY, REQUEST=AUTH, and REQUEST=DEFINE macros or to perform any additional security checks. Postprocessing exits are available to override or modify results of the RACF® processing performed by these three macros. Because several of the RACF commands use REQUEST=AUTH and REQUEST=DEFINE when performing their functions, you can use the REQUEST=AUTH and REQUEST=DEFINE exits for some command tailoring.