The Browse Tab In SharePoint 2010 Ribbon

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Required Foreword
This post is a part of the upcoming series about SharePoint 2010 and related technologies. I'm an enthusiast of SharePoint platform (especially of 2010 version) and I like very much to explain things I know to others. These articles is my attempt to systematize my own knowledge of platform and to help others to understand it. I'd like to hear from you if there are any mistakes or things on the subject of the given article that are not covered. You can write your comments here or on my email - mail@alexboev.com.
I will update any article as my knowledge will improve. And sorry for my English - it's not quite good now but I'm learning. :) Fill free to point me on any mistakes.

While viewing CMDUI.XML file you can find a tab with "Ribbon.Read" identidier and with empty scaling and groups sections:

<Tab Id="Ribbon.Read" Sequence="100" Command="ReadTab" Description="" Title="$Resources:core,TabRead;" CssClass="ms-browseTab">
   <Scaling Id="Ribbon.Read.Scaling">
   </Scaling>
   <Groups Id="Ribbon.Read.Groups">
   </Groups>
</Tab>

It's the Browse tab of the Ribbon. The Browse tab is a special tab and it can't be customized with Server Ribbon XML. The purpose of this tab is hiding of the most Ribbon interface in page read mode - when the Ribbon isn't needed.