User Instances In SQL Express -- Need Code Samples

I would like to have more info on UserInstances concept of SQLExpress 2005.

Can i find any code samples for this feature in MSDN.

I have tried using the following links..
http://msdn2.microsoft.com/en-us/library/ms143401(SQL.90).aspx
http://msdn2.microsoft.com/en-us/library/ms143684(SQL.90).aspx
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnsse/html/sqlexpuserinst.asp
http://msdn2.microsoft.com/en-us/library/ms254504.aspx
http://msdn2.microsoft.com/en-us/library/ms165690(SQL.90).aspx
http://msdn2.microsoft.com/en-us/library/ms143446(SQL.90).aspx



any other links will be helpful for me in this regard.

Thanks,

Vaishu