A QR code is a code you can scan with the camera of a device or touchscreen.
After you have scanned the code, the information embedded in the code will appear on the screen.
The teacher can share a Presenter file. The URL of the shared file becomes visible upon sharing. The teacher can copy this URL and convert it to a QR code.
Print the QR code on paper or share it digitally. The students can now scan the QR code with their own device and open the Presenter file or tool on the device independently.