User: Can you tell me about the Porsche 993 targa?
Assistant: In 1996, Porsche introduced the 993 in a targa variant. Though targas had been around from Porsche for decades, there was a new approach with the 993 model. They implemented a so-called "greenhouse" system whereby the glass roof retracts underneath the rear window, revealing a large opening. This allowed the 993 to have the same side profile as the coupe models, but without the inconvenience of storing the removed top of the old system.