In addition, XEchelle uses dialog windows to input specialized parameters necessary for the different reduction steps. These windows are popped up by pushing the three-dots button corresponding to each calibration and reduction step on the left-hand side column of the Main Panel. These windows contain text fields, option menus and radio buttons. Values are given by moving the mouse inside the parameter fields or selecting an option by clicking on the relevant button. Push-buttons yielding to a dialog window are indicated by three dots in the label. For example, clicking on pops up the Sky Background window. This window can be closed by clicking its button.