The DWM-156 Notification Windows Driver is typically associated with the D-Link DWM-156 USB modem, which is a device used for mobile broadband (3G or 4G) internet connectivity. The driver enables the proper communication between the modem and the operating system (Windows) so that you can use the modem to access the internet.

In addition to the driver, the notification part generally refers to the software that alerts you to connection statuses, data usage, or other relevant updates related to the modem. It's often bundled with a D-Link software suite that provides a user interface for managing the connection, checking signal strength, and managing data traffic.