This section introduces the basics for using quex. A minimalist, but complete, example shall display the process of generating a lexical analyser engine with quex. A short section gives an overview over the major sections of a quex definition file. In two separate sections the definition of patterns and their related actions is explained. Pattern-action pairs are grouped in modes. The particularities of mode definitions is explained in a dedicated section. At this point in time the user is familiar with the syntax of the input language of quex. A final section discusses the command line arguments for the invocation of quex on the command, or in Makefiles and project files.