export in v2.7?

[Richard Gaskin]

In the olden days the export command worked only on the screen buffer, 
which meant that you couldn't export anything that was offscreen, and 
anything overlapping the window you wanted to export from was included 
in the exported image.

I have a vague recollection somewhere that v2.7's new buffer management 
has altered this to allow exporting portions of a specified window 
without regard for anything overlapping it.

Am I dreaming?  If not, what is the syntax to make this happen?

-- 
  Richard Gaskin
  Fourth World Media Corporation
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  Ambassador at FourthWorld.com       http://www.FourthWorld.com