X-Seed is a software tool for X-ray crystallographers and runs under any of the 32-bit Microsoft Windows operating systems including 95, 98, Millennium Edition, 2000 and XP. Many of its features are tailored to meet the needs of scientists interested in solid-state supramolecular chemistry. The two primary functions of the software are (i) to serve as a graphical interface to the SHELX-97 program suite, and (ii) to produce high-quality molecular graphics images. In addition to these features, many other useful functions are also implemented in order to facilitate the process of crystal structure solution, refinement, analysis and presentation.