PolySync Studio provides a replay module that allows you to manage active runtime nodes by instructing which active nodes the logfile session should load. Active runtime nodes and their runtime status can be viewed using the [System Hierarchy](/articles/?p=924) plugin. Each Dynamic Driver node─one per sensor defined in the SDF, also shown in the System Hierarchy plugin─receives the command from the replay module. Next, each Dynamic Driver node loads an individual `.plog` file to asynchronously parse, processes, abstract, and publish the sensor data to the bus as a high-level PolySync message. The PolySync Dynamic Driver nodes handle synchronizing with other runtime nodes through the Logfile API. The process of replaying data is described here: [Replay Logs And Visualize Sample Data](/articles/?p=2164).