Where is this interactive toolbar coming from?

We have a Maxell MC-TW3506 interactive projector. I connected a freshly reimaged Windows laptop using HDMI and a USB cable from the projector to the laptop. No projector software was installed.

The interactive pen works, and I also get a floating toolbar with options like pen, mouse mode, and other annotation tools. I can close the toolbar and it disappears.

My question is: where is this toolbar coming from? Is it built into the projector, built into Windows, or is some software being installed automatically when the USB cable is connected?

I'm trying to understand how the annotation tools work even though no software was manually installed on the laptop.