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**[[introduction.htm|CHAPTER 1 - Introduction]]** provides an introduction to the Clarion Language Reference. It provides a brief overview of the contents of each chapter, and a guide to help the reader understand the documentation conventions used throughout the book.

**[[program source code format.htm|CHAPTER 2 - Program Source Code Format]]** provides the general layout of a Clarion Windows program. Punctuation, special characters, reserved words, and a detailed description of the "building blocks" required to create modular, structured Clarion source code are documented here.

**[[variable declarations.htm|CHAPTER 3 - Variable]]**[[variable declarations.htm| ]]**[[variable declarations.htm|Declarations]] **describes all the simple data types used to declare variables in a Clarion program. In addition, data display formatting masks, called "picture tokens," are defined and illustrated.

**[[entity declarations.htm|CHAPTER 4 - Entity Declarations]] **describes all the complex data types used to declare GROUP, CLASS, FILE, VIEW, and QUEUE structures in a Clarion program.

**[[declaration attributes.htm|CHAPTER 5 - Declaration Attributes]] **describes all the attributes which can modify variable and entity declarations.

**[[window structures.htm|CHAPTER 6 - Windows]] **describes the APPLICATION and WINDOW data structures and all their component structures.

**[[reports.htm|CHAPTER 7 - Reports]] **describes the REPORT data structure and all its component structures.

**[[controls.htm|CHAPTER 8 - Controls]] **describes all the controls that may be placed into APPLICATION, WINDOW, and REPORT data structures.

**[[window and report attributes.htm|CHAPTER 9 - Window and Report Attributes]] **describes all the attributes which can modify APPLICATION, WINDOW, and REPORT data structures and the controls they contain.

**[[expressions.htm|CHAPTER 10 - Expressions]] **defines the syntax required to combine variables, procedures, and constants into numeric, string, or logical expressions.

**[[assignments.htm|CHAPTER 11 - Assignments]] **defines the all the methods to assign the value of an expression to variables. This chapter also discusses BCD operations and Clarions Automatic Data Type Conversion.

**[[execution control.htm|CHAPTER 12 - Execution Control]] **describes the compound executable statements that control program flow and operation.

**[[built in procedures.htm|CHAPTER 13 - Built-in Procedures]] **documents all built-in Clarion library procedures.

**[[dde  ole  and  ocx.htm|APPENDIX A - DDE, OLE, and OCX]] **documents the procedures that perform Dynamic Data Exchange (DDE), Object Linking and Embedding (OLE), and OLE Custom Controls (OCX).

**[[filesearch.htm#events|APPENDIX B - Event Equates]] **documents the EQUATE statements for events that help make Clarion code readable.

**[[runtime properties.htm|APPENDIX C - Runtime Property Assignments]] **documents all the runtime properties.

**[[error codes.htm|APPENDIX D - Error Codes]] **documents the runtime and compiler errors.

**[[legacy statements.htm|APPENDIX E - Legacy Statements]] **documents language statements which are maintained only for backward compatibility with previous versions of Clarion.