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This is the documentation for the latest 4D Feature Release. Looking for a LTS documentation? Select 20, 19 or 18.

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Getting Started

Installation4D at a glanceRelease Notes

Project & IDE

Creating or opening a projectArchitectureProject SettingsDatabase structureCode & MethodsDependenciesCompilationApplication BuilderDebuggingApplication Preferences

4D Language

ConceptsCommands by nameCommands by themeClasses

Core Development

ORDAProcessesDatabase MethodsTransactionsTransformation tagsDate and Time Formats

Web Applications

4D Qodly Pro Web ServerREST Server

Desktop Applications

Client/ServerFormsMenusLabelsUser SettingsAccess Rights

Server & Admin

4D Server WindowWebAdmin & Data ExplorerCommand Line InterfaceTLSLicensesLog FilesMaintenance and Security CenterBackup and Restore

Extensions

Extending 4D applications4D Qodly Pro 4D View Pro4D Write Pro4D NetKit 4D AIKit4D Progress 4D SVG 4D Widgets 4D QPDF Go Mobile with 4D Build4D