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# HM Graph Expert - Deployed
The HMGraphExpert is a script based interaction module. The script can have multiple steps and can branch out to alternate steps based on user input. Typically, this expert is activated in training simulations where the user is guided through a scripted interaction.
This expert can control the flow of a simulation by directing performances by virtual persons/objects and well presenting audio/visual feedback to the user. The script used by this expert can be authored using our dialog authoring tools as well as by coding the script in its native JSON format.
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