Wireshark-users: [Wireshark-users] Wireshark 1.2.0 & .Support for IP packet comparison

From: "Keith French" <keithfrench@xxxxxxxxxxxxx>
Date: Fri, 10 Jul 2009 15:32:38 +0100
In the release notes for V1.2.0 it says that Support for IP packet comparison is included.
 
I can't find any documentation on this, what can you compare & how do you do it?