That is not how Livelink works.There is no concept for certain folders by userid.You are approximating a convenience maesure.
Having said that I think these may be things you are after.
A list of folders whose owner is a certain userid.That does not mean a thing in any livelink.People or groups who have elevated access to them may have already checked out/in those items.
GetFolderByFolderID what are you trying to d.If I have got a dataid of 3456,are you wanting to find what type it is where is it located,who is on its permission list etc etc
For that one would use the command GetObjectInfo.If it is a folder or container,then you call ListObjects again and agin for its children until you expend the tree.
The closest user related thing that I know is the users personal workspace.I have not seen a lot of collaborative/useful work ever done in users PWS,although it is a convenient place to practice livelink,permissions etc.
Let us know what exactly is your task so others who may have different ideas than mine could chip in as well
Well, if I called the wrong number, why did you answer the phone?
James Thurber, New Yorker cartoon caption, June 5, 1937
Certified OT Developer,Livelink ECM Champion 2008