I talked with my friend again, and he cleared some thing up for me. Apparently what I have always called "horizontal dropouts" are actually labeled as trackends, or trackend dropouts. I apologize. I wasn't understanding the posts you all were posting because I was thinking of some thing entirely different.

So, Live Wire: yes, that is what my friend was thinking, I guess. A bike that has trackend dropouts, so he can move the wheel for different kinds of tricking and landing but then take off that wheel and put on a different wheel and a derailer and be ready to commute. Is that what I'm seeing in this picture?

Sorry, again, for the confusion.