slide styles: coordinates for positioning of elements

Dear readers of this list,

I do not quite understand the coordinates used in prosper slide styles to 
place elements like title, psframes and so on. I know how to manipulate these 
things by try and error, but I would prefer a more systematic approach.

For example the troispoints style in the prosper manual:
To which coordinates refers the position in the line close to the end
\NewSlideStyle{t}{5.3,2.9}{TPFrame} ?
                            ^^^^^^
(By the way, what are the possible options for the "anchor" apart from t or 
c?)

And to which coordinates refers the position of the psframe, for example, 
eleven lines before
\psframe[....](-2,-1.4)(12.5,9)

What is the origin (0,0) for the psframe, and what is the origin for the 
NewSlideStyle-Position?

Thanks for helpful hints in advance

Yours sincerely

Tobias Hilbricht



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