Conversational Programming Language

This document serves as both a tutorial and a reference guide for the Conversational Programming Language (CPL). It is designed to help users with varying levels of experience, from absolute beginners to advanced programmers. The manual covers the basic language elements, data types, programming manipulation statements, and control flow. It also details advanced topics like based storage, pointers, list processing, and error handling via ON-conditions. The manual includes comprehensive lists of built-in functions, error messages, and a summary of the CPL language, alongside information on running CPL under the TOPS-10 and TOPS-20 operating systems.