DCI meaning in Computing ?

The Wizards Play Network (WPN) is the official sanctioning body for competitive play in Magic: The Gathering (Magic) and various other games produced by Wizards of the Coast and its subsidiaries, such as Avalon Hill. Originally, it was known as the DCI (formerly Duelists' Convocation International) but was rebranded in 2008. The WPN provided game rules, tournament operating procedures, and other materials to private tournament organizers and players. It also operated a judge certification program to provide consistent rules enforcement and promote fair play. The DCI's name was still commonly used, however, to refer to the player registration number ("DCI number") until 2020.