The EVDO Rev B AT Port driver is related to the EVDO (Evolution-Data Optimized) Rev B standard, which is an advanced version of 3G mobile data technology, offering higher speeds and improved network efficiency. The AT Port refers to the AT Command Interface used for communication with devices such as mobile broadband modems, USB dongles, or wireless network cards that support EVDO Rev B. These devices use the AT command set to establish and manage network connections.

In the context of Windows, the EVDO Rev B AT Port driver enables communication between the EVDO modem device (such as a USB dongle, PCI card, or a laptop with a built-in EVDO modem) and the operating system. It helps Windows recognize the device, configure the connection, and allow the modem to communicate with the mobile network.