The application is intended for use by small groups of people–say, two to ten–collaboratively, for a few hours at a time. There may be many small groups working simultaneously, but activity won’t overlap among groups, only among members of a given group.
Say Alice, Esha and Mallory are using the application, which means having the page open in a tab or window. Each of them has a panel on that page showing what the other two are up to. Alice has five heads-up tokens, and she flips two of them over; I want Esha and Mallory to see that her tokens now consist of three heads and two tails within a few seconds of her doing so. This should not require any activity on Esha’s or Mallory’s parts except having the application page open.