This work focuses on people working in the computer industry, whether lawyers or computer professionals, and explains the relevant principles, prohibitions and penalties of EC competition law. Topics covered include: primary markets and aftermarkets; predatory innovation; and e-commerce, outline of EC competition law, lawy relting to research and development, standards setting, technology transfer and software licensing, primary markets versus aftermarkets, predatory innovation, undertakings given to the EC commission by IBM and Digital, doctrine of essential facilities, and discussion of the Microsoft case.