The Internet has opened new ways of learning and has brought several advantages to computer-aided education. Global access, self-paced learning, asynchronous teaching, interactivity, and multimedia usage are some of these. Along with the advantages comes the challenge of designing the software using the available facilities. Integrating online presentation of learning material with intelligence, interactivity, and simulation results in learning material enhancing the learner aid functionality. The present work describes the development of a Web-based intelligent interactive course on data structures (WINDS). The courseware is in the form of an electronic textbook on the Web integrating intelligence, interactivity, visual simulation, and animation sprinkled with audio. User centered contents can be accessed on demand. (Contains 4 figures.)