Page Breaks - what are they for?

[Chris G <cl isbd net>]

I'm confused (no change there then!) about what the 'Page Break'
markings do for me.

It took me a while to realise that the solid blue lines *were* the Page
Breaks and that I could remove them using the Preferences settings. 
That's good as I find them distracting because they sit very close
to some of the major grid lines on my system.

However I also don't understand what they're for, they don't appear to
indicate actual paper size blocks on the diagram, on my system they seem
to be just over 15cm wide (hence the blue line is very close to the 15cm
grid line) and 24cm high.  The default paper size on my system is A4 so
those dimensions are nothing like the paper size.


Playing a bit further I'm now also confused by the Dynamic grid setting
and the general usage of the rulers and grid lines.  When I set a
diagram to Dynamic grid and zoom in and out the grid lines change
sometimes but not other times, does it just do its best to keep the grid
lines at about the same size?


Final question - is it possible to reset the top left corner of a
diagram to 0:0 on the rulers?

-- 
Chris Green