ALTID= parameter for procedures
Use the ALTID= parameter to specify a 1- to 4-character name for an alternate IMS system.
When your IMS message processing region tries to link to an IMS system, it tries to link to the system specified by the IMSID= parameter. If no IMS system matches the name that is specified with IMSID, the message processing region tries the system that is specified with the ALTID= parameter. If no IMS system matches the name that is specified with ALTID=, what happens next depends upon the option you choose on the OPT= parameter.