How to Reference other player's object spawned with PhotonNetwork.Instantiate() ?

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Each player get something like:

GameObject foo = PhotonNetwork.Instantiate("PlayerPrefab", ...);
foo.something = bar; // Goal Operation to perform on other's PlayerPrefab in the local Client

This only work for the owner of the object however, as the version spawned automatically will not run this code.

What is the correct/best way to fetch a reference to the other player's "PlayerPrefab" in this case?

Thank you.