Cheers Baggins, I appreciate all the time you put in and guess what?

I get it now, I proper get it.  The only problem I'm left with, and this is entirely down to me not the system, is where math is involved.  I get that aspect of it as well, but it's not something I'm ever going to be able to do at a leisurely pace.  I absolutely hated maths at school and used to twag as much of those lessons as I could get away with.  These days, the only reason I hate maths is because I'm not efficient at it, and unless it's basic stuff, I just reach for a calculator by default.

That said, at least I understand the system now, so again, thanks very much for that

Now that I'm not thinking blindly, I should be able to absorb what I see, and even the fancy stuff, I'll get that after a few looks.  One of the reasons I've suddenly become so interested in the nodes is because I was going to model my sequencer as a way to get practice in with both Wings3D and the Poser Material Nodes.  It's got one of those blue monochrome backlit LCD displays, and I wanted to be able to mimic how it fades and inverts depending on the angle it's viewed from.

Definitely a job for some nodes, although even understanding the system, I'm going to have to do a fair bit of playing around before I can do something like that.  On the one hand something tells me it might be quite simple to do, but then I think no, hang on, that might not work or even be possible.

Haven't attempted it yet, but to do it I'm guessing I'd need two planes: one for the graphics and one for the background.  That they both need to react to the camera in an opposite way (to get the inversion effect depending on angle), and that the data collected from the camera controls the effect on each plane or something like that.