Trapping? Dangerous Subject
http://www.graphic-design.com/DTG/Graphics/trapping/

Showker, Fred
Design, Typography and Graphics
2001

Abstract:

Oh, it's in vogue these days isn't it. Trap here. Trap there. All the computer graphics experts and magazine writers showing off their divine knowledge, writing about 'trapping.' Some people don't even know what trapping is. Some don't even care. But the computer industry sure wants us to know – and they want us to buy the latest and greatest software to prove it. Do I sound cynical? (He asks with a sly grin.) Your first line of defense in avoiding trapping traps is to understand the concepts.