How could I make a live shared document? [closed]

Okay, now here's the issue. I would like to make a "live shared document", like Google Docs. If you have no idea what I'm talking about, this is what I mean:1) I would connect with another person2) I would be presented with an area for me to type text out.3) While i'm typing, the other person is seeing my type each letter at the same time that I type it.4) Once I push enter, he would reply by typing on his end. I would see him type each letter as well.The project I'm working on doesn't require that I see each letter being typed, however that would add a cool feature to this.I'm thinking this would be powered by Javascript/jquery and maybe a little PHP. Please let me know your thoughts on how this would be done!Oh and one more thing, in google docs, you have this big canvas that you can type in (the paper). This would kinda be like a huge textarea, but how would I make the other person be able to type in my textbox as well (I think that's what I'm asking lol)
 
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