Establishing APPC/IMS

Before activating APPC/IMS, an IMS system definition is needed to specify 390 as the third parameter of the SYSTEM keyword for the IMSCTRL macro.

CPI Communications driven application programs and LU 6.2 application programs cannot be defined in a system definition. LU 6.2 application programs are only defined to VTAM®.

Start APPC/IMS by specifying APPC=Y on the IMS startup parameter. The default is APPC=N. When 'N' is specified, a connection to APPC/MVS™ services is not established during IMS initialization. When 'Y' is specified, IMS establishes a connection with APPC/MVS during IMS initialization. The /START APPC command overrides APPC=N.