JSR168 Cooperative Portlet and Credential Vault

[developer Singh]

Can anybody has a tutorial or example for implementing JSR168 cooperative portlets in the websphere Portal ?

And i am not able to understand the flow of Credential Valut specially how to implement Single Sign On in Websphere Portal v 5.1? I would be thankful if somebody tells the inner details for credential vault behaviour implementaion in Websphere Portal with live example?

cameron, (portorials.com) i saw your site its very good and lot of material is available related to portlets...but i will be thanksful if you can provide me tutorial for the above said problem with live examples?