Set BI launch pad start page using default settings

Hi all,

I'm working on a SAP Bo BI 4 installation. I'm verifying how to set a default start page on BI Launch pad for let all users see a custom workspace that I created. In particular, I'd like to set in each user preference the setting "Use Default Settings (Administrator defined)" and change the default home tab.

How can I set the custom workspace for every user that uses default setting?

Thanks.