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To compare two scans made at different times, select File | Compare scans menu item, or press Compare scans button, select Show by date or Show by domain option, one scan at the left (under Report #1) and the second scan at the right (under Report #2), then press Next.You will see the list of patches that were added and removed (at two different tabs).
Please note that it is strongly recommended to compare only the scans that have been made on the same machine.
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