Douglas Wilder, Ultimate Renumber Utility Douglas Wilder published one program though Atari Program Exchange, Ultimate Renumber Utility, which he co-wrote with his father, Justin Wilder. It first appeared in the winter 1981 APX catalog, but was featured in the catalog for less than a year: in the winter 1982 catalog, it was replaced by BASIC/XA, which did renumbering as well as other functions for programmers. This interview took place on January 26, 2018. Teaser quote: "So we got enough money off the sales of that through APX that it paid for both my father's computer and mine." Ultimate Renumber Utility in the winter 1981 APX catalog