The Matrox G450 Multi-Monitor Windows driver is a software package that enables the Matrox G450 graphics card to work with your computer's operating system. The Matrox G450 is a graphics card that supports multi-monitor setups and was popular in the late 1990s and early 2000s for users who wanted to extend their desktop across multiple displays. The driver allows the system to fully utilize the capabilities of the card, such as dual-monitor configurations, extended desktop, and possibly even triple-monitor setups depending on the version of the card.