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Kismet runs on the server unless you mark an event as "client-side only", in which case it runs on the client. If the Kismet needs to communicate between server and client somehow, and the nodes we want to use don't do that (or don't do it in the way we want; e.g. Matinees will run on the server and replicate the actor changes to every client, but replicating every changed property every frame or so can end up being pretty expensive for non-gameplay-relevant actors), there are some tools to fix that. See /wiki/spaces/CHIV/pages/622626Client-side Kismet.