Your answers cleared up my confusion. I went back and re-read chapter seven, and thought it all over for several days, and I'm going to keep my minimal essential business files, and now I'm thinking of them in terms of action support files, next to my desk, along with my tickler file.
And I'm going to totally clear off my desk of everything except my computer this morning, and keep it that way. The in-box and action support files and tickler file can go on a table next to the desk. The desk keeps getting so cluttered up with things I've been working on or leave out that I only have a few square inches of clear space. It clutters up my mind and I can't get anything done.
Thanks for the ideas and for clearing it up in my mind.