Between documents, e-mails, instant messages, news feeds, Facebook and browsers, on-screen real estate gets a little crowded. Multitaskers keep up with the deluge with bigger screens, riding hard on the tab key, and increasingly, a multiplication of monitors. Many data crunchers preach the benefits of having two, or even three screens operating simultaneously in their workspace. Matt Richtel reports on technology for the New York Times, where he wrote about the multi-screen movement.