As your roving correspondents, we have to, of course, rove. As in hit the road, roam far afield, attend a conference, track down a story. When we do travel, we go — as do you — with an array (too many?) of screens. A small one in our pocket. A mid-size one for reading. And then there’s the laptop. Our travel laptop, which has been with us awhile, is still running the comforts of Windows XP as its operating system.