Most dual-monitor setups in the DOS era used ... plug are entry-level cards using years-old technology. VGA died quietly, with its cables stuffed in a box in a closet, and the ports on the back ...

Something, that is, like dual-screw locks on cable connectors ... standard for connecting your gaming monitor was a DVI-D cable if you were lucky, or a VGA cable if you were not.

There are a few different reasons to use a dual monitor setup on ... you're planning on using. Some monitors connect via USB cable, some connect via VGA cable, and some connect via HDMI.