Conclusions
The time management services of the HLA are central to achieving interoperability
among analytic simulations using event driven or time stepped mechanisms to advance
simulation time. The time management system includes mechanisms to ensure time
stamp ordered delivery of messages, we well as mechanisms for federates to advance
logical time so that the federate does not receive messages with time stamp less than its
current logical time. Time management transparency so that one federate need not
understand the local time management structure of other federates is key to achieve
interoperability among federates using different local time management mechanisms.