Maximum printable area on a page

[Graham Samuel]

I know how to find out the page size and the margins of a page when 
preparing to print from a Revolution stack (via global properties), 
but I haven't seen anything that allows a script to determine the 
printable area on the page - this would normally be expressed as the 
minimum margins a print command can use to avoid cropping. This data 
certainly available as part of the API of all modern printer drivers 
on both the Mac and Windows.

Is there a way of doing this I've missed, or if not, what approach 
have other people taken to allowing users to set margins within 
reasonable limits?

TIA

Graham

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          Graham Samuel / The Living Fossil Co. / UK & France