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When the Update Manager opens click the Check button to see if there are updates available.
The updates will proceed and you can continue on with¬† your work.
There are is a new tool in development (Ksplice)¬† that allow even the update of a kernel to not require a reboot.
To get information about a particular update all you need to do is to select a specific package and the information will be displayed in the bottom pane.