title: Excel Macro UI design: How to let the user select several inputs
body: <p>The following question is to a lower extent a coding, but rather a UI design problem:</p>
  
  <p>Suppose I have a button somewhere calling a macro when pressed. Now the macro needs two different inputs -- say, two ranges. Then it does something with the inputs and writes the result somewhere. What is the best way to let the user specify these two input ranges?</p>
  
  <p>If it were not two, but only one input, it would be easy: We would let the user select the input and then, after the button being pressed, the macro could look for the selected range and evaluate that. Does anyone have any idea how a user-friendly solution in case of two inputs could look like?</p>