Let I X be the saturated homogeneous ideal defining a codimension two arithmetically Cohen-Macaulay scheme X P n , and let I ðmÞ X denote its m-th symbolic power. We are interested in when I ðmÞ X ¼ I m X : We survey what is known about this problem when X is locally a complete intersection, and in particular, we review the classification of when I ðmÞ X ¼ I m X for all m ! 1: We then discuss how one might weaken these hypotheses, but still obtain equality between the symbolic and ordinary powers. Finally, we show that this classification allows one to: (1) simplify known results about symbolic powers of ideals of points in P 1 Â P 1 ; (2) verify a conjecture of Guardo, Harbourne, and Van Tuyl, and (3) provide additional evidence to a conjecture of R€ omer.