Shared Folders / Shared Docs Common ID?

[cityline]

UserA has the FolderUA as a outbound shared Folder in his cabinet
UserB has a the same folder as an inbound Share under the name FolderUB in
his cabinet.

How can I find a common ID?

oFolderUA.FolderID is different from oFolderUB.FolderID
oFolderUA.Owner is the same as oFolderUB.Owner

- How can I be (programmatically) sure, that oFolderUB points to oFolderUB?
- Is there a property of oFolderA and oFolderB that is unique and has the
same value?
- Or is there a way to determine that they are really the same?
- Or can I get somehow the oFolderUA.FolderID only having the object
oFolderUB?

The same would apply for documents that Users share:
- How can I determine programmatically, that the DocumentUA with the DocumentNrUA of the sharer is the same as the DocumentUB the DocumentNrUB?
- Knowing the DocumentNr of the Sharers Document (UserA), how can I know the DocumentNr of the incoming Shared Doc of User B?
- Knowing the DocumentNbr of an incoming shared Document of us User B and knowing the Sharers Name, how can I find out the DocumentNbr of the document of UserA (the sharer)?

Your help is appreciated
Beat