Horse communication?

I know this sounds kinda... idiotic. What is a horse "saying" to the other when they put their noses together and sniff extremely loudly?

Couldn't figure out where else to put this.

Usually when a horse blows air out of their nose really loud it's because they are nervous and trying to figure out what something is. My mare does it when I introduce a strange new object to her (like a scary cell phone!). Did the two horses just meet each other for the first time? If so they were probably just trying to figure each other out.
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Horses usually touch noses like that when they meet each other for the first time.

What they are doing is "identifying" each other through scent. There is an old cowboy tale that says if you take a horse a blow into its nose like another horse does, the horse will never forget you.

No. They have know each other for around four months. Its the two mares in my avatar. Each time they do it my QH will go to bite my rescue. I also was wondering because the recuse continues to do it to me as if I'm a horse... lmao
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I think they are just saying hello =)