Let me just state for the record that Wiremold's documentation is some of the worst I have ever seen in my life, and their Website was obviously built by moderately-trained monkeys in the 1990s. Their online catalog plays paper noises when you turn pages. No, seriously. And there's no entry at all on their site for the "On-Wall" line, even though they went to the trouble of registering the trademark. In fact, their entire site consists of an undifferentiated bucket of PDFs with some kind of AJAX-y search-ish functionality in a side bar, and the results it returns are essentially useless.
I finally found the only published instructions for how to use their channel system on page 11 of 17 of a sales brochure for home products, consisting of a single 2x3" box with four blurry pictures. It's like living in a Douglas Adams book.
So anyway, lousy documentation, pretty nifty series of products. I'm going to use them in a couple of places, like the lights I'm putting on the back staircase in the big house. (Yes, I actually started doing something in the big house this year. Amazing, ain't it?)