Technical Notes › Server Types › OSF Servers › TSO OSF Servers

TSO OSF Servers

TSO servers execute asynchronous TSO commands under the control of the IBM TSO Terminal Monitor Program (TMP). There are three sub-classes of OSF TSO servers:

• OSF TSL servers—intended for long-running TSO commands, CLISTs, and REXX EXECs
• OSF TSP servers—intended for high priority TSO commands, CLISTs, and REXX EXECs
• OSF TSO servers—intended for all other TSO commands, CLISTs, and REXX EXECs

OSF TSO servers have certain capabilities and attributes that the OSF TSL and TSP servers do not have, such as:

• Commands can be sent to OSF TSO servers directly from a system console by using the OSFCHAR command prefix.
• Using ADDRESS TSO in a NOWAIT or non-TSO environment results in the TSO command being sent to the OSF TSO execute queue.
• The OPSRMT command sends transactions only to the OSF TSO server queue.
• The OSFMIN and OSFMAX parameter values cannot be set to zero. The minimum value of these parameters is 1.