Recovery from errors and failures is a prime consideration in the design of transaction programs. LU 6.2 provides optional services to help transaction programs recover from errors. LU 6.2 sync point services enable transaction programs to synchronize their resources when partners in protected conversations fail or encounter errors.

VTAM® offers pass-through support for sync point services, but the application program must implement these services. VTAM enables the application program to implement sync point services. VTAM supports the flow of PS headers, which enables the application program to implement the sync point manager. The sync point manager polices the protected conversations and resources.

For detailed information on sync point services, refer to the SNA Transaction Programmer's Reference Manual for LU Type 6.2 and the SNA LU 6.2 Peer Protocols Reference .