Download Microsoft SQL Server Protocol Documentation Authored by Microsoft
The Microsoft SQL Server protocol documentation provides detailed technical specifications for Microsoft proprietary protocols (including extensions to industry-standard or other published protocols) that are implemented and used in Microsoft SQL Server to interoperate or communicate with Microsoft products.
The documentation includes a set of companion overview and reference documents that supplement the technical specifications with conceptual background, overviews of inter-protocol relationships and interactions, and technical reference information.
Abstract courtesy Microsoft Microsoft SQL Server Protocol Documentation
Reference : Pinal Dave (http://blog.SQLAuthority.com)