APPC Subsystem on MPE/XL Node Manager's Guide (30294-90007)

26 Chapter1
Introduction
The APPC Subsystem
The Node Manager’s Interface to the APPC Subsystem
Through the APPC subsystem, the node manager can control the
network activities for LU 6.2 products. The APPC subsystem interface
provides interactive control operator commands that allow the node
manager to perform the following functions:
• Activate and deactivate the APPC subsystem.
• Control the number of active APPC sessions.
• Determine the status of APPC sessions.
• Display performance statistics for active APPC sessions.
• Enable and disable the gathering of performance statistics for the
APPC subsystem.
• Enable and disable tracing of APPC subsystem internal events.
• Dump the APPC subsystem internal data structures to a dump file.
• Perform LU 6.2 software module version checking.
The APPC subsystem also provides programmatic control operator
intrinsics that allow transaction programs to perform the following
functions:
• Activate and deactivate the APPC subsystem.
• Control the number of active APPC sessions.
• Determine whether or not the APPC subsystem is active.
Chapter 2 , “Interactive Control Operator Commands,” describes the
control operator commands, and Chapter 3 , “Control Operator
Intrinsics,” describes the control operator intrinsics.
The APPC subsystem generates error and warning messages and
provides an internal tracing facility. Internal tracing records APPC
subsystem internal activity. It can be activated or deactivated as
needed. There is also a logging facility that you can configure to record
major APPC subsystem events such as startup and shutdown. Logging
configuration is described in the SNA Link/XL Node Manager’s Guide.