USB Monitor Pro captures and displays the following types of events: URB, INTERNAL_IOCTL and IRP of PnP and Power Management subsystems. These events are displayed in Events window. As soon as new event is captured it's immediately displayed in the window.
Every event has its own unique number, type, direction (out from the Host Controller Driver or into the Host Controller Driver), timestamp and status of processing packet by the Host Controller Driver.
Selecting any event it's possible to get more detailed information in the Structure of Event window.