Code of Civil Procedure Article 67-1
The court may, at an appropriate time prior to the conclusion of oral-argument in the first or second instance, serve a written notice of the action and the phase reached to a third party who is legally interested in the outcome of such action.The third party notified in accordance with the provision of the preceding paragraph may file, within five days of service of the notice, the motion provided in the first paragraph of Article 242.Wherever the third party notified in accordance with the provision of the first paragraph is qualified to intervene in accordance with the provision of Article 58, the provision of the preceding Article shall apply mutatis mutandis.