A PDU is a structured message which transfers essential data of a specific type from one simulation entity to another and allows them to participate in a common exercise. For example, DIS PDUs comply with the DIS PDU Message Standard. [MSETT - DIS Glossary, LORAL 22SEP92]
I-PDU ngumyalezo olungiselelweyo odlulisela ugcino-lwazi olubalulekileyo lohlobo olucacisiweyo olusuka kwinto ekhoyo yemfaniso ukuya kwenye kwaye kuyayivumela ukuba ithathe inxaxheba kulolongo oluqhelekileyo. Umzekelo, i-DIS PDU evumelana nemigangatho yomyalezo ye-DIS PDU. [MSETT - Uluhlu lweenkcazelo ze-DIS, LORAL 22SEP92]