Hi, I tried to execute the code at http://code.google.com/intl/de-DE/apis/opensocial/docs/0.8/devguide.html#Persistent but I am not able either to save and retrieve data on a viewer. If someone has an update about that please let me know. Here is the code that gives "undefined" as answer. Thanks...

Nevermind, i have found a nice example on goolge code http://code.google.com/apis/opensocial/docs/0.8/devguide.html#Persistent , that shows how to store and retrieve the data, and i tested the code and it worked fully :)