<!DOCTYPE html><html lang="el-GR"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Send messages · System Designer</title><meta name="viewport" content="width=device-width, initial-scale=1.0"/><meta name="generator" content="Docusaurus"/><meta name="description" content="In this tutorial we will show how to react to messages send by the system."/><meta name="docsearch:language" content="el-GR"/><meta property="og:title" content="Send messages · System Designer"/><m