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I am starting to have tremors also but so far I am able to work around it, mostly by taking a deep breath just before touching the scree with the s-pen. But I wish I could find a way to disable the button on the s-pen.
The nib on the pen is spring loaded and moves in and out very slightly as you increase or decrease pressure. The electronics in the phone and pen can detect how far the pen is from the screen and are sensitive enough to pick up the difference in distance when you press harder. You don't even notice the tiny movement yourself, which is why it feels so much like writing with a good pen.
Yet another reason to not call the S pen a stylus. It isn't.
It depends on the app settings you have setup and the app you are using. Sometimes it changes the width, color and/or opacity.Thanks. But what happens to the function of the pen if pressure is increased? Line thickness changes? Or something else?

The S4 does not contain the digitizer to read the S pen.Dumb question: could an S-Pen be used with the new Samsung S4 and still retain all its cool features? Or is it expected that the S4 would have neither the proper screen hardware nor the right software to give you the full S-Pen experience?