This summary is not the rule. The rule text controls.
If a court order gives benefits to someone who isn't officially part of the lawsuit, or if the order needs to be enforced against someone who isn't a party to the case, that person is treated the same as if they were a party. This means the same rules and steps apply to them.
In practical terms, this protects people who benefit from a court order even if they weren't directly involved in the original case. It also means someone who isn't a named party can still be held to an order if the order applies to them. The court can use its normal enforcement tools, like ordering someone to do something or stopping them from doing something, no matter whether that person was an original party to the lawsuit.
This rule keeps things fair. It stops people from avoiding a court order just because their name wasn't on the original paperwork. It also makes sure that people who were supposed to get help from a court order can actually receive it, even if they had to join the process later.