Canon 543

Can. 543 §1. If the pastoral care of some parish or of different parishes together is entrusted to priests in solidum, each of them is obliged to perform the tasks and functions of pastor mentioned in cann. 528, 529, and 530 according to the arrangement they establish. All of them have the faculty of assisting at marriages and all the powers to dispense granted to a pastor by law; these are to be exercised, however, under the direction of the moderator.

Can. 543 §2. All the priests who belong to the group:
1º are bound by the obligation of residence;
2º are to establish through common counsel an arrangement by which one of them is to celebrate a Mass for the people according to the norm of can. 534;
3º the moderator alone represents in juridic affairs the parish or parishes entrusted to the group.