Hi there, I am totally new to PHP. I have been an Network/Infrastructure Engineer for 9 years and am now setting up a website. After reading the tutorial on here I feel underdstand the user creation/Password creation-validation stuff but this is what I need: 1 User to login 2 User to create a group or join an exisiting group. (simple data will be held on per person in the group) 3 User can only exist to one group. 4 How do I secure the database down so the user can only modify their data?? I am hoping that the groups will reach a large number. Don't know if thia had any impact. Any help would be gratefully appreciated. If I can help anyone with server/infrastructure stuff pls let me know!! Thanks very much Col