[tivert]

> The original Quick Turn Reel Units operated on Palm Pilots.

I also found this that describes what those are:

https://www.sciencestation.org/projector.htm:

> Combine this with the theatre's "quick turn reel" that allows the film to be replayed without being rewound and you have the world's most sophisticated film projection system.

So the role it plays in the production process is to control some kind of film handling machine.