Wonderful answer, very informative and explanatory, as well as in-depth. I've yet to check out Reimer's tutorials, though I've had the page book marked for a while, I'll have to check that out shortly.
I'm unsure why he drew 6 points, when two were the same location and it would save space. I gather the assignment of the values is pretty much to mark which vertices have the same points to put them into the vertex buffer?
indices and indeces are the same point in the rectangle, and thus have the value 0. (top left)
indices and indeces are the same point in the rectangle, and thus have the value 1. (bottom right)
indices has a value of 2, being the only vertex at that point. (bottom left)
indices has a value of 3, being the only vertex at that point. (top right)
That's pretty much where it stops making sense. I'll have to toy around with the process and maybe read more about the API and how it handles this whole process.
I'll have to read more on the vertex buffer, as the book has only covered the index buffer. I must say I'm not a a fan of these books, they don't get into the information as much as I'd like them to, but they're helpful nonetheless.
Thanks again for your answer!