Distributed Game Development - What are appropriate & latest technologies?

I have a situation. Its more like a design and use of appropriate technology sort of question.
I am developing a board game say, chess - but it will be played by upto 4 users or only one user (AI).
Client sides are applets;
Game logic running on Glassfish Server.
Applet to Backend communiction -> web services
...but question is How Backend notify all other players' boards to update clients(applets) on their side with new move?
Thanks for your favor in anticipation.

I have a situation. Its more like a design and use of appropriate technology sort of question.
I am developing a board game say, chess - but it will be played by upto 4 users or only one user (AI).
Client sides are applets;
Game logic running on Glassfish Server.
Applet to Backend communiction -> web services
...but question is How Backend notify all other players' boards to update clients(applets) on their side with new move?
Thanks for your favor in anticipation.

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