UNIX for Advanced & Expert Users

Hi

I have requirement to create 3 new users on my server but to restrict their access to a set of particular folders.

/export/home/kapil/shared,
/export/home/kapil/shared/Folder1
/export/home/kapil/shared/Folder2

These folders should be accessible to all the 3 users and to me too. I should be the owner of all the folders and also new users should be able to write the files inside these folders and should be able to rename the files created by me.

Is there is any way to achive this?

Create a group, add yourself and the other 3 to it - fire a chown -R yourname:newgroup on the folders. chmod to your needs.
Regarding new users you might think about setting permissions for "others". If it isn't sufficient you might think about using ACLs.

Also you might want to read in this:
http://tldp.org/LDP/sag/html/index.html