4C is a RPG toolkit rather than complete game system; it provides a foundation for you to build upon. As presented, 4C is speciically for superhero roleplaying though it could be adapted to other genres with a bit more work.
This is the core rules book for the 4C system. It includes a book of rules and the required master chart. The system appears to be an open reimplementation of the FASERIP system used by Marvel Superheroes.
NB: The system book available from Lulu is missing the Master Table (which is required for task resolution). 4C is also available from other sources with the missing Master Chart included. A 'Streamlined Master Table' is also available separately.