Protocol related data generated by a simulation application are captured. One or more protocol objects are displayed in a window on a display device based on the protocol related data. The protocol objects represent events associated with the interface protocol. In at least some embodiments, a location of the protocol objects on the display device is correlated to a simulation time. In at least some embodiments, protocol-related data are grouped according to an abstraction level of the interface protocol, and the protocol objects are displayed on the display device based on grouping. The protocol objects displayed on the display device can be associated with concurrent, interleaved protocol events, or both.