If you want to exclude some URLs, clear the checkbox to the left from these URLs. After the update is over, you should see the Page Rank values in the PR column. The Trend column shows the change since the last update.
You can export the data to a CSV file using the Project | Export to CSV menu item.
Use this screenshot as an additional example.
System requirements: Pentium 200 MHz, 32 MB RAM, Windows 98/2000/XP/Vista, Internet access.