A co-execution is the co-simulation execution of two analysis jobs where one model uses an Abaqus/Standard analysis and the other model uses an Abaqus/Explicit analysis. The jobs are executed in synchronization with one another using the same functionality as described in “Understanding analysis jobs,” Section 18.2. For more information on this analysis technique, see “Performing an Abaqus/Standard to Abaqus/Explicit co-simulation,” Section 14.1.3 of the Abaqus Analysis User's Manual.