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The keys you're talking about are called modifier keys. They modify what else is being pressed at the time. Sometimes they are used on their own too, as you noticed with the control and spacebar.
The keyboard shortcuts Nick showed don't take just a modifier key. Also I don't think there is any way to revert back to whatever previous tool you were using.
You could go into the keyboard shortcuts and Add to Eyedropper, then press the button on your tablet pen, maybe it would register as a key press. If it doesn't, are you able to map that button to the letter i?
That still wouldn't give you a way to go back to the previous tool. If that previous tool is usually the Selection tool, you could map another button to the letter v (if the pen has another button).
How come you need to use the eyedropper so much?
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That is very pretty Nipun, but do you know that it doesn't answer the question that was asked? Keefachu wants to be able to press a button on a tablet stylus and have the eyedropper tool appear, then when the button is released whatever tool was previously selected would be active again. I don't know of a way to do that.