This work documents the CSM (Contexts as SICStus Modules) environment, a contextual logic programming framework built up from SICStus Prolog system. Contextual logic programming is a simple and straighforward extension to the logic paradigm, providing a versatile yet powerful mechanism to dynamically structure logic theories. With respect to the previous works, CSM offers the concept of context as a first-class object and an industrial-level programming framework. This work provides an introduction to CSM system, the full set of CSM operators, predicates and directives, and some tutorial examples of the CSM language.