Multi PC file

How do I make a program which can be read from another computer. I mean you insert some "information" and it can be immediately read from another computer. I will explain it with a picture:



A -------------------------------> B
(info) -----------------------> (info)



A ------------------------------------> B
(new info) --------------------> (new info)
I mean something like a news source from which friends can read information which you have written.
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