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The party needs to be served. And there is a Certificate of Service on each document which the party filing attests that the other party has been served. So, they can't lie and say they tried and did not try.
If a party is not served because there is no way to locate them, then there can be service by publication wherein the information runs in the Legal Notice section of the local newspaper
Yes, they can unless one party request there be a continuance due to a conflict