System action causing refresh of users screens

By Jason Herrington on 18 Mar 2015
I think I posted this idea awhile back but want to give some better context for it.

Lets say I am running something like amazon and two people are viewing widget X and included on that screen is stock: 6 meaning I have 6 of widget X in stock.  Lets say the first person buys 2 of widget X.  What I would like is the ability for the system to say "ok, my stock of widget X has dropped by 2, lets look at any sessions that are viewing widget X and do an ajax refresh on their screen just for the stock detail to move it from 6 to 4".
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