You have now learned how to send SMS messages using ActiveMQ as a message broker and Twilio's Programmable SMS API. You've built a basic appointment reminder solution that sends reminders a few minutes before each appointment. The system uses Apache ActiveMQ as the message broker, which schedules requests to Twilio's Programmable SMS API. The client applications are written in Node.js, leveraging the Twilio helper library for easy integration with the API.