How to turn your smartphone into a remote mouse and keyboard

Picture: It's past midnight and your favorite TV show is running on your computer, doing its job of trying to tire you into sleep. But you had a double espresso shot just before your shift finished, and you're still wide-awake, ready for more. The episode ends, and now your video player is gloomily projecting its watermark and a black screen. You can't go to sleep, not just yet -- you need at least another episode or two for that. But you don't want to get up and go across the room to queue more episodes, either. What do you do? You grudgingly get up, put on your flippers that no outsider is supposed to see, and crawl towards the computer to do the job.