That is probably URESA.... Reciprocal Enforcement of Support Act. That was the method for dealing with support when the parties were residents of two different states. That procedure was replaced several years ago under UIFSA, whereby the support enforcement agebncies of the 2 states cooperate with one another.
This post is not meant to be legal advice for a specific situation. Additionally, it does not constitute an attorney client relationship. It is always recommended that you consult with the attorney of your choice before taking action which can affect your legal rights.