The Role of TSO in the Architecture

The TSO facilities, which are a standard part of z/OS, play a prominent role in CA OPS/MVS architecture.

TSO provides the following two important features to z/OS users:

Service Routines
- Invoked by any address space
- Exhibit the reliability and availability characteristics of the address space that invokes them
Interactive Services
- Invoked by the TSO network solicitor address space
- Reliable for most purposes (for example, OPSVIEW runs under them), but not enough for core CA OPS/MVS facilities such as the AOF
- Availability depends upon VTAM, JES, and various z/OS services