[texhax] changing margin inside a page

[Cyril Niklaus]

Hi all,
I'm trying to typeset a exam page for which I wish to leave a large  
right margin, but only starting at the middle of the first page and  
continuing on to the next pages.
I tried finding a solution, but nothing came up in regard to changing  
the margin not globally but for a section only.
I thought of using columns, but then the right column would not be  
empty, using minipage didn't work on several pages so I am stumped.
I'm sure there must be something obvious which I'm overlooking, so I  
would welcome any pointers!

Thanks
Cyril