Why not give your friends and family full access so that anybody can send selfies, control playback features and add to the song queue with their favorites?
You can easily give full permissions by default to all users, hook your Mac to the TV, and then display the QR Code on the screen for easy access.
Why not give the remote address via URL or via QR code to your attendees so that they can browse the catalog before ever signing up for a song? Or go even further and let them add what they want to sing directly to the queue (karaoke self-service).
You can even give yourself full control from your second device and stay away from your computer, alongside your audience and save their requests directly into the app.
Same applies for karaoke bars! How about sharing the catalog with your customers? Give them the URL address and let them pick the songs they want to sing directly from their smartphone. No more paper catalog: it's cost-efficient and stays updated at all times!
Each room has a unique remote address, meaning you can let your customers login and have full access for a unique experience, or setup an iPad in the room, that controls KaraFun Mac hidden in a closet.