The Pascal socket interface uses the IUCV/VMCF services for a limited set of inter-address space communication flows. As a result, if you are using any applications (provided by IBM® or others) that use the Pascal socket API, you must ensure that the Virtual Machine Communication Facility (VMCF) and Termination Notification Facility (TNF) subsystems are active before the applications are started. TCP/IP provides the following applications and commands that use the Pascal socket interface:
If you are using any of these applications or commands, you need to set up VMCF and TNF.
You can configure VMCF and TNF in two different ways: as restartable subsystems or as non-restartable subsystems.
If you configure VMCF and TNF as restartable subsystems and you want the VMCF node name to be used as a default host name during TCP/IP initialization (when no other host name can be located), VMCF must be started before TCP/IP.