| Function | Description | Message Key(s) |
|---|---|---|
| SDP | SUPPLEMENT NICS INDICES RECORD | SDP |
| SON | SEX OFFENDER RELOCATION NOTIFICATION | SON |
| SOQ | QUERY NLETS SEX OFFENDER REGISTRATION | SOQ |
| SPO | SERVE PROTECTION ORDER | SPO |
| SQ | QUERY SNOWMOBILE REGISTRATION | SQ |
| SRPO | SERVE EXTREME RISK PROTECTION ORDER | SRPO |
| SWQ | QUERY NLETS STATE WARRANTS | SWQ |
| SXOHELP | QUERY SEX OFFENDER REGISTRATION HELP FILE | SXOHELP |