This book is intended to discuss architecture and implementation of true three-tier applications with MTS. The book will use both Visual Basic and Visual InterDev as development platforms but the emphasis is always on the VBA/VBScript language. The goal of this book is to help programmer's create applications that use a single set of business objects from both a thin web client and a thin Visual Basic client. The book is divided into four parts that encompass the user services, business services, and data services followed by a final complete project. The four parts of the book include the Data Services Layer, Business Services Layer, User Services Layer, and Project. Topics covered will include: Visual Basic Business Objects, COM/DCOM, Microsoft Transaction Server, Data Access with ADO, Transaction Server API, Transaction Processing, Creating Visual Basic front ends, Using Microsoft Transaction Server with IIS.