Why is by default present in web.config file ?

Hi all,

I am new to SharePoint world. I am using SessionState objects in my application. But because of the line

<remove name="Session" />

in the web.config file of the web application, this object is always null.

Please tell what is the reason for the presence of this line in SharePoint 2010, but not in SharePoint 2007.

Thanks in advance.

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srnitk