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Or more specifically, where is that code coming from? I guess it's not from the components built on top of web forms? Is it the IIS integration? Anyone have a (link) meaningful - (not marketecture) diagram describing this? SP really seems like a collision of so many different MS technologies.

Thanks!

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It may come as a surprise to you (which only shows how little it has been written about this) but most of the ‘important’ things in SharePoint are actually done through unmanaged code and the SharePoint .NET object model provided by the Microsoft.SharePoint.dll is a sort of a wrapper to this unmanaged world. Understanding how your code does what you want it to do can be very helpful when troubleshooting issues, fixing bugs, doing performance tuning and writing solid code in general so I believe that every SharePoint developer should know about SPRequest.

As you are aware the gateway to doing anything in SharePoint is the SPSite object. In order to get to any other objects that reside in a site collection such as SPWeb, SPList, SPListItem, SPFile and others we first need to obtain an SPSite and there is a very good reason for that. Every SPSite instance holds a reference to the unmanaged WSS world in the means of a field member of type SPRequest which is called m_Request. The internal SPRequest class has an unmanaged reference to a COM object called SP.SPRequest and having a ClassID of BDEADEE2-C265-11D0-BCED-00A0C90AB50F which is implemented in and exposed by the OWSSVR.DLL class library.

The SP.SPRequest COM object exposes almost 400 basic operations and almost everything you do with the Microsoft.NET managed SharePoint object model that reads from or writes to the ContentDatabase (including data, fields, content types, list schemas, etc) will actually go via this unmanaged COM object.

For more info read Hristo Pavlo's post

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