Can people connect to my computer via airplay if I use their wifi?

I've always wondered this about the airplay function, and I'm not sure if that's possible because on the top right hand corner there is an airplay icon and when I look through it I can find some AppleTV's that do not belong to me and are from the place in which I use my wifi. What I mean by the question is can they connect without my permission and view my screen without me knowing?
I currently use Yosemite 10.10.1

AirPlay is a protocol, as you know, that is used to stream a multimedia source from an AirPlay-ready source to an AirPlay-ready "receiver." That source can be a computer running iTunes or an iOS device. The receiver can be an Apple TV, an AirPort Express, or an AirPlay-ready third party speaker/receiver.
As such another computer on the same Wi-Fi network could not use AirPlay to access your Mac's screen or files. That would be a totally different set of protocols. In addition, you would need to enable your Mac to accept these types of requests.

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