[Zope-PTK] How to write into another members folder?

[Ivan Mackintosh]

>> I wish to create an object in another members folder. 
>
>Perhaps a silly question, but: "Why?"
>
>Usr1 doesn't have permission to write to usr2's folder. This is likely
>the cause of being redirected to a login page.

Because - 

usr1 submits a paper that is co-authored by usr2. Therefore I want to
put a link to the paper in usr2's folder so that usr2 can see when its
status has changed etc.