We've tried to organize the source code in as logical a manner as possible. The source code is divided by language, and each language is subdivided by the type of example presented. Within each of these subdivisions, three types of labels are used to designate the environment in which the example was created. If your labels are System-standard, here are the designations (otherwise, take a look at the environment-specific folders to see the colors as they appear on your system):
