The implementation focuses on creating a video call room and retrieving the list of attendants before the participant joins, allowing for a more organized and comfortable experience. The app uses Daily's Client SDK for JavaScript to create a pre-join lobby and display the number of participants already in the call. When a participant joins, they can see who else is in the call through Prebuilt's own UI. The server-side implementation involves making an HTTP request to Daily's REST API to retrieve the presence data, which is then unmarshalled into a JSON format and displayed on the client-side. The code showcases how to implement this feature using JavaScript and Go, with the relevant Daily REST API endpoints remaining the same regardless of language.