When the parties to a dispute inform the court that they have reached a settlement, and the court issues an order dismissing the case with prejudice—only permitting it to be reopened for "good cause"—that is ordinarily the end of the court's involvement in the parties' dispute. But what happens when the parties subsequently disagree about whether they reached a settlement and move to reopen the case? Does the parties' dispute about the existence of the settlement constitute "good cause" required to reopen the case?