I am new to DotNetNuke and I wanna develop my own Single-Sign-On module so that we can share our other local databse for authentication and authorization for security purposes, and also import/export data from other SQL Server data base

In version 4.0.2, how can I use another database to hold the user information while still using the membership functionality in DotNetNuke. I have already looked at the Doc that comes with dnn. While it describes how the new provider is integrated into DNN. I cant seem to see how to switch to another data store.

Please tell me from where i start and please forward any usefull link like tutorial telling detail about about situation

Is this possible.

thanx in advance