While building SAS/IntrNet applications, I would like nothing better than to have someone with the skills of Don Henderson looking over my shoulder. Other than some SAS-L posts and a few personal e-mail messages, this desire went unrealized. That was until I read Don s book, Building Web Applications with SAS/IntrNet: A Guide to the Application Dispatcher. This book picks up where SAS documentation leaves off. It shows how to increase the functionality of the SAS/IntrNet Application Dispatcher to solve problems commonly encountered when building Web-based SAS applications. This book also supplies a host of best practices that can help keep one from creating future difficulties. An example of the gems that Don has unearthed is the INVSESS option. This option allows developers to implement friendlier responses to failed attempts to reconnect to a session. Along with techniques to refresh long-running requests, this book shows how to partially overcome the problem of user sessions that time-out from user inattention. One of the most helpful chapters is Chapter 11, Tools and Techniques for Debugging. One especially useful tip is to seed programs under development with %testPrint macros to conditionally print intermediate results. This chapter also provides good guidance on how to run Application Dispatcher programs in a stand-alone mode. In my opinion, this is a must-have book if one is responsible for creating or maintaining Web-based SAS applications. --Michael Davis