The Sierra Wireless CNS Port Windows driver refers to a software package that enables communication between your Windows computer and a Sierra Wireless device (such as a USB modem, mobile hotspot, or other cellular devices) using a virtual COM port (CNS port stands for Communication Network Service Port). This driver typically allows your computer to interface with Sierra Wireless devices through serial communication, enabling data transfers, remote management, and sometimes even SMS functionality.

If you're using a Sierra Wireless device that requires this driver, it allows your computer to recognize the device as a COM port and interact with it through serial communication protocols.