The C.D.P. Bundle can be used to typeset high-quality business letters formatted according to Italian style conventions. It is highly configurable, and its modular structure provides you with building blocks of increasing level, by means of which you can compose a large variety of letters. It is also possible to write letters divided into sections and paragraphs, to include floating figures and tables, and to have the relevant indexes compiled automatically. A single input file can contain several letters, and each letter will have its own table of contents, etc., independant from the other ones. The author is Gustavo Mmezzetti.