A system and method for event-driven simulation of a circuit is disclosed. The system includes a simulation history of events and node values at various times throughout the simulation of the circuit. The system allows the user to access the simulation history during the simulation, make changes to the...http://www.google.com.au/patents/US6173241?utm_source=gb-gplus-sharePatent US6173241 - Logic simulator which can maintain, store, and use historical event records
