Hosting and domain costs until October 2024 have been generously sponsored by dumptruck_ds. Thank you!
Map based hacks
From Quake Wiki
This page is intended to be an explanation of the tricks written about on this page: http://www.celephais.net/board/view_thread.php?id=37116
If the people who have used the tricks in here, or know a lot about them (i.e. Preach, Negke) could add stuff, that would be fantastic.
Map based hacks are keys added to entities that add functionality to the entity that it was not originally intended to have. They are possible because of the way Quake C works and allow the level designer to effectively replace functions in entities with other functions from the Quake C code.