依赖于主机屏幕光标位置的功能。
另外一种鼠标替换物是视线跟踪系统，它能判断出你的视线移动的位置并相应地调整屏幕光标移动的位置。
Another alternative to the mouse as a pointing device is to use a gaze-tracking camera, which works out where you are looking and moves an on-screen pointer accordingly.
电视机——所配置的遥控器只能上下或横向移动屏幕光标，而且一次只能做一步操作——正与由iPhone倡导的触控手势结盟。
Television sets-with remote controllers capable of moving on-screen cursors only up, down and across, and then just one step at a time-are leagues behind the swiping gestures pioneered by the iPhone.
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