The level of conversation-level security defines the fields in the FMH-5 that the application program can use to implement conversation-level security. The FMH-5 can have both security indicators and subfields. The subfields can contain user identifiers, passwords, and profiles that the application program can use to implement conversation-level security.

For more information on the fields in the FMH-5 that are related to conversation-level security, see Verifying end users using conversation-level security. For more information on the architected LU 6.2 verbs necessary to implement a security program, refer to SNA Transaction Programmer's Reference Manual for LU Type 6.2.