Matrox Graphics eXpansion Modules
Building on the innovation of their high-performance multi-display add-in boards, Matrox has developed Graphics eXpansion Modules (GXMs), a new line of patent-pending technology that allows you to add multi-display support to your system. Matrox GXMs are small boxes that connect externally to a notebook or desktop and uniquely allow users to attach two or three monitors for an incredible multi-monitor configuration.
Matrox GXMs are ideal for notebooks users looking for a cost-effective, space-saving multi-display docking station. They are also the perfect solution for individuals looking to add extra displays to closed, already validated systems or to computers with no available expansion slots or to desktops with integrated graphics that are limited to one display output.
More information can be found here.