This chapter provides an overview of IMS-managed application programs that run in IMS-dependent regions.
IMS defines an application programming model to be used for accessing IMS services based on the type of dependent region runtime environment. A program specification block (PSB) establishes the interface from the application program to IMS services and the IMS-managed resources the application program is authorized to access. A program communication block (PCB) is the connectivity to an IMS-managed resource. The PSB consists of one or more PCBs that are provided to the application program.
The IMS services can be used for the following:
• Sending or receiving messages using an I/O PCB
• Sending ...