The comprehensive documentation for MQL4, the programming language for MetaTrader 4 (MT4), is available directly from MetaQuotes, the company behind the MetaTrader platforms. The documentation serves as a valuable resource for both beginners and experienced programmers, offering detailed insights into the language’s syntax, functions, and capabilities.

MetaQuotes Documentation Portal

The official MetaQuotes website hosts the primary source of MQL4 documentation. Here’s where you can find it:

1. MQL4 Community Website:

• The MQL4 Community website (https://www.mql5.com/) serves as a hub for resources related to MQL4 and MQL5. It provides access to the official documentation, articles, forums, codebase, and various tools for traders and developers.

2. MQL4 Documentation Section:

• Within the MQL4 Community, the “Documentation” section offers detailed insights into the MQL4 language. It covers topics ranging from basic syntax to advanced concepts, including:
  • Data types and variables
  • Functions and function libraries
  • Standard constants and enumerations
  • Handling of events and trading operations
  • Custom indicators and expert advisors development

3. Articles and Tutorials:

• The platform includes a vast array of articles and tutorials contributed by experts and community members. These resources offer practical examples, case studies, and in-depth explanations, allowing users to enhance their understanding of MQL4 through real-world applications.

4. Codebase and Downloads:

• The Codebase section provides access to a repository of free source codes, indicators, expert advisors, and scripts written in MQL4. Exploring existing codes can provide insights into coding best practices and help users learn by studying practical implementations.

MetaEditor Integrated Help

MetaEditor, the built-in development environment within MT4, also contains a substantial amount of information about MQL4. Here’s how to access it:

1. MetaEditor Help Section:

• MetaEditor includes an integrated help section that provides context-specific information about functions, keywords, and syntax. Users can access this information by pressing F1 or navigating to the Help menu within MetaEditor.

2. Code Autocompletion and Suggestions:

• While coding in MetaEditor, users can take advantage of the built-in code autocompletion feature, which suggests function names, parameters, and syntax, making the coding process more efficient. This feature also offers brief descriptions and hints about functions as you type, aiding in understanding and implementing them correctly.

Conclusion

The complete documentation of MQL4 is available through the official MetaQuotes website and its integrated resources within the MetaEditor. By utilizing these resources, traders and developers can access comprehensive information, examples, and community-contributed content to enhance their proficiency in MQL4 programming, allowing them to create sophisticated and efficient trading systems and indicators within the MetaTrader 4 platform.