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# The simulation repeats from step (1).
AIS includes a [[deadlock avoidance]] mechanism using null messages. The mechanism requires that the processes have exploitable [[Combinatorial search#Lookahead|lookahead]] characteristics.
====Object management====
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Distributed object ownership presumes that no single simulation must own all objects in a confederation, but many simulations require knowledge of some objects. A simulation uses simulation protocol update messages to discover objects owned by other simulations. If this simulation is interested in the objects, it can ghost them (track their locations and state) and model interactions to them from owned objects.
Locks implement attribute ownership. A primary function of the object management protocol is to ensure that a simulation only updates attributes for which it has acquired a lock. The
Each attribute of each object known to a given ACM has a status that assumes one of three values:
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