What is "Windowing" an E-book?

I was reading an article last night about "windowing" and I noticed a lot of people in the comment thread didn't know what "windowing" meant. So here's a quick post about it, with a few comments from me below.

From Teleread:

Delaying (which is to say, “windowing”) the e-book has been tried, but not all “serious readers” are so biddable as to let themselves be pressured into buying the hardback. Many of them will submit one-star reviews on Amazon decrying the publisher’s asinine anti-e-book pos...