Margins in the printer properties

[Sascha Sommer]

Hi,
what are the differences between the margin settings in the text property page 
and the margins that can be specified in the margin property page?
Gwenview for example will always use the later, however unlike the ones from 
the text property page, they do not seem to come from the ppd. I think this 
will be problematic when the printer requires different margins.
Is this the intended behaviour?

Sascha