# An Overview of Help

Help systematically documents the features, operation and internal workings of the software. It contains three Parts: Basic Operations, Deeper Details, and Technical Appendices.

Part 1, Basic Operations, documents controls, menus, and palette items (building blocks, tools and objects). In Chapter 2, you'll find a description of the controls associated with each of the three levels. Chapter 3 provides a detailed treatment of menu items. Chapter 4 documents the building blocks on each level. Chapters 5 describes tools. Chapter 6 documents objects.

In Part 2, we look at deeper details associated with the Map/Model layer. Chapter 7 describes in detail each of the Builtin functions, functions which can help you to accomplish a variety of specialized tasks as you construct the equation logic of your models. Chapter 8 documents the process of bringing data into and out of a model. Chapter 9 provides details on the workings of Sub-models. Chapter 10 details the Cycle-time calculation capabilities. Chapter 11 concludes Part 2 with details about Arrays (again, available only in Analyst or Research versions).

Finally, Part 3 consists of technical appendices. In Chapter 12, you'll learn more than you ever wanted to know about DT, the solution interval the software uses for making its calculations. Chapter 13 documents the numerical integration algorithms employed by the software. Chapter 14 looks at the internal rules of grammar used by the software to control connections between building blocks, prioritization of flow calculations, and the like. Chapter 15 provides a set of technical tips and troubleshooting techniques.