SourceUSB logs the initiation and completion of several types of USB I/O requests and function calls which are summarized below:
| URB | URB Request |
| MPORT | Miniport-Usbport Interface |
| IHUB | Hub-Usbport Interface |
| USBINT | USB Internal Ioctl |
| PNP | PnP Request |
| PWR | Power Request |
| HUB | Hub Ioctl Request |
| HCD | Host Controller Ioctl Request |
| HID | HID Ioctl Request |