Whereas Doom, Doom II, and Heretic rely on lines within the maps to perform simple actions, Hexen also allows these actions to be activated via Action Code Script (ACS).
Morse code | action film | Total Nonstop Action Wrestling | action | Cyrillic script | Internal Revenue Code | Strike action | People's Action Party | Democratic Action Party | Arabic script | Action film | The Script | The Chicago Code | The Da Vinci Code | Chapter 11, Title 11, United States Code | ZIP code | Latin script | class action | source code | International Code of Zoological Nomenclature | live action | DVD region code | Criminal Code of Canada | Action-adventure game | A Civil Action | Uniform Code of Military Justice | National Action Party (Mexico) | National Action Party | code | Action Comics |