VTAM® issues this message as part of a group of messages in response to a DISPLAY ID command for a PU that is the physical resource for one or more groups of logical lines. VTAM issues message IST080I to indicate the name and status of the logical lines associated with the preceding PU.

VTAM also issues this message as part of a group of messages in response to a DISPLAY ID command for a switched frame relay physical line whose switched PU is the physical resource for one or more groups of logical lines. VTAM issues message IST080I to indicate the name and status of the logical lines associated with the preceding physical line.