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Definitely something you have to get used to, but once you do, it’s pretty cool. Heck, on the latest Apple MacBook line, there’s no button at all: the trackpad is both the dragging and tapping surface. I’m not sure when that started to be popular, but just about all trackpads now seem to have the ability to detect taps in addition to sliding fingers, so it’s quite common now to find computers – Mac and PC – that have the capability you’re talking about.
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