Solve a probability effect.

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Sorry for my English.

I am new with "PUN" and I do not understand very well how clients communicate. I have a multiplayer game project in which each character will use specific skills, there are some that have probabilities, for example probability of healing or critical damages, what happens is that obviously these probabilities can not be defined by each machine independently, I thought that the masterClient resolved it, but how do I communicate to the other user if it was a successful probability or if it was not?

Thank you.