"The PC Upgraders Manual: How To Build And Extend Your System" by Gilbert Held is a comprehensive manual that provides detailed instructions on how to upgrade and extend your computer system. Written in English, this manual is designed for individuals who want to enhance their PC's performance by building and adding new components to their existing system. It covers various aspects of upgrading, including selecting the right components, assembling the system, and optimizing the software for optimal performance. This manual is a valuable resource for anyone looking to improve their PC's capabilities and maximize its potential.