Supports multiple display devices simultaneously, usually showing additional info on the other displays or alternatively expanding the field of view to them.
Alternate names: Multiple monitors, Multiple adapters
Name variations: Eyefinity
The first video game about Multihead was released on September 1971.
Expanding the view to other displays is usually accompanied by rather exotic display aspect ratios, such as 8:3 (two 4:3 monitors) and 12:3 (actually 4:1, three 4:3 monitors).
This is NOT for cloned displays.