Bloglines not updating
From the updates and servicing node you can first run a prerequisite check before installing the update.
We will not go to much into detail on this specific topic.
If you want to read more details about the updating process I recommend this post by Kent Agerlund.
I have recently had reason to update the Picture URL property value via Power Shell in Share Point 2010 for all users in the system.
As a result, I wrote the following Power Shell script to update the property value using string replace.
Through the service connection point the site becomes aware of new updates.
If any updates are available they are listed in the Sites and Servicing node in the Configuration Manager Console.