A step-by-step tutorial to developing a language processor for a ``little language'' which can be used on any platform including DOS. The view is towards applying language processor techniques, using them across diverse languages and providing procedures for designing programming languages. Details how to build a compiler for a little language that you can design, along with numerous examples of code to demonstrate how to implement your own language processor. Disk with interpreter and utilities developed in the book is available separately or in a set.