Can I get a couple of lay, i.e. dumby, explanations of exactly what the hell Top Dead Center is? And also, how exactly do you acheive it? Are there any tricks or something? It's required for a couple of different procedueres, so what exactly did you all do to achieve TDC. (Sounds like acheiving Moksha or something.)

I'm gonna review this damned Haynes manual again to try and get some more specific questions.