An Illinois Summons In an adversary Proceeding (ILN) is a legal document issued by a court to notify a person that they are being sued by another party. It contains the name of the court, the parties involved in the proceeding, the action being taken, and the date on which the person must appear before the court. There are two types of Illinois Summons In an adversary Proceeding (ILN): the personal service summons and the publication summons. The personal service summons is served by a process server or sheriff, and requires that the person be personally served with the summons. The publication summons is served by posting a notice of the summons in a local newspaper, and requires that the person be served by mail. Both summonses require the defendant to appear before the court and answer the complaint or face a default judgment.