Globus Toolkit 4 is an open source software toolkit used for building grids. There is a severe shortage of good "how-to" material on grid and especially on Globus. With GT4 making its debut this year, this book is set to be the one book that any beginning programmer must have. It covers the fundamental aspects of GT4 (basic grid services and security), as well as, more advanced topics (information services, job management, etc.) making it an essential reference for programmers of all levels. The grid community has met Sotomayor's work with enthusiasm. The New York Times has called The Globus Toolkit the 'de facto standard' for Grid computing and MIT Technology Review named Globus Toolkit-based Grid computing one of the 'Ten Technologies That Will Change the World.' With the release of GT4 this technology is taken to a new level, a new format, and a new depth of information making this the premier book for GT4.