AGI stands for adventure game interpreter it was used in the 80's to make graphical adventure games. Some of the most known would be Space Quest, King's Quest, and Leisure Suit Larry.
SCI was the engine that replaced AGI it had lots of new features like mouse support and a pop up parser and not to mention better graphics. SCI stands for Sierra Creative Interpreter.
We use tools made by lots of different people and make our own games that use these interpreters. Right now I am working on a game called
V - The Graphic Adventure whith a few other people.
If you want to know more about it check out my web site at
http://www.agi.zzn.comAGI is a real simple language to learn and is sort of like using a basic language such as QBasic.