Dear Conan, I work at Salem-Teikyo University and have been put on a proposal writing team. Jobs are hard to come by, so I want to do what I am instructed to do, but I really don't have a clue in this instance. Excellent question, and I shall answer it to the best of my ability. Keep in mind, however, that I must do a lot of guessing, because your question is lean and panicky. When a new CD player comes on the market, for instance, Radio Shack will have a technical writer look at the schematics of the device, perhaps even play a CD on it, look at the controlling electronics, and write up a user's manual.
Technical writers are much in demand, and are highly paid, because few people can do what they do.
An example is a technical writer who works for, say, a pharmaceutical company. His job is to know and understand drugs and to write about them in different contexts. He might write a highly technical paper to the FDA, or he might write the directions on the label of the drug when it is sold. Significantly, writing is related to almost everything, and that is why writing skills are taught in public school and required in college. Unfortunately, in recent years writing has almost disappeared as an academic discipline, and writing is more often than not seen as a tedious, boring, and oppressive task to be shoved off on subordinates.