FlavorProperties GUID in csproj File

So I was looking at an open source's csproj file and noticed this:

<ProjectExtensions>
   <VisualStudio>
       <FlavorProperties GUID="{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}">
         <HostingProcess disable="1" />
       </FlavorProperties>
   </VisualStudio>
<ProjectExtensions>

What does this do to a C# project and what is it telling visual studio to do? MSDN has this to say but I wasn't entirely sure what they meant or where this would be applicable(MSDN MSBuild):

A project subtype can also modify the XML fragment before or after it delegates the call to an inner project subtype. The following example shows an excerpt from a project file, where a name of a file that contains properties specific to a project subtype, is passed to that project subtype

Any insight is appreciated!

Thanks!