VSTO - Office PIA IntelliSense
Microsoft IntelliSense XML Files for Microsoft Visual Studio Tools for the Microsoft Office System
Overview
Adds summary descriptions of types, members, and parameters to IntelliSense ToolTips in code and in the Object Browser for Microsoft Office Word 2003, Microsoft Office Excel 2003, Microsoft Office Outlook 2003, and Microsoft Office 2003 Shared PIAs in Microsoft Visual Studio .NET 2003 and Visual Studio 2005.