When users have only one certificate but need to connect to multiple systems that require different user IDs, you can assign user IDs based on the system identifier (SYSID). The SYSID is the 4-character SID value specified in the SMFPRMxx member of SYS1.PARMLIB on each system. You specify system criteria using the predefined variable &SYSID with the CRITERIA option of the RACDCERT MAP command for MULTIID filters. You must use the RDEFINE command to create profiles in the DIGTCRIT class to associate each SYSID value with the user ID indicated by the APPLDATA value.