GoalControl, which aims 14 cameras at the two goals in each World Cup match and produces 500 computer generated 3-D images in a split second, was called into action for the first time in France's 3-0 Group E win over Honduras.
This is football and even the way the technology worked caused arguments. But GoalControl, only set up in 2012, is enjoying its moment in the spotlight.
In the match, Karim Benzema's shot cannoned off a post and then hit Honduras goalkeeper Noel Valladares and went over the line.
The computer gave two judgements which were flashed onto the stadium screen. The ball was not over the line when it rebounded off the post, it said. Some fans thought that was the end of the matter.
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Then it said that there was a goal after the ball hit Valladares.
GoalControl which has 40 staff and is based in the small western town of Wuerselen wants to use the incident to play in the big league.