The Novatel Wireless Expedite EV-DO Diagnostic Port Windows driver is a specific driver that enables your computer to communicate with a Novatel Wireless modem, typically the Expedite series (such as Expedite EV-DO) over a USB connection. This driver allows you to access the diagnostic interface of the modem for purposes like troubleshooting, configuring settings, or checking the status of the device. The EV-DO (Evolution-Data Optimized) is a technology for mobile broadband, commonly used for internet connectivity via cellular networks.