ADOX.Catalog Users and Groups

Hi,I'm trying to learn more in VB.Net about Jet 4.0 using ADOX, in particular to create Users and Groups. I've tried to create Users and Groups as part of the Database creation step, or appending afterwards using commands like .....

objCatalog.Groups.Append("GroupName")

..... but keep getting error "Object or provider is not capable of performing requested operation".

Yet, I am able to quite successfully create Tables, Columns, Keys, etc.

I see there is something about a "Workgroup Information File ... System.MDW ..... even when I include a reference to this file in my ConnectionString, do I still get the above error.

Is there something I'm missing, or somewhere I can read-up more about Users and Groups as a security feature in a Jet database.

Thanks for any pointers - Pierre