What does the mouse button do?

[Ax01]

i was boarding a plane last night and i noticed a peculiar looking button on the controls of the jet bridge.





do u see it?



it's right here!



they were all really busy boarding everyone and i forgot to ask when the crew was more relaxed during de-planing. the one at the arrival gate didn't have this button tho. i remember less buttons and a bigger joystick.

[Bogertophis]

I believe that triggers the ejection seat for when a passenger is really being a "rat"?

Or else it's the panic button for when there's actually a mouse running around? Really I have NO clue.

[MR Snakes]

It is the feed button for the passengers?