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From the context menu, one can select a slider to be attached to a variable, which is a GUI “knob” allowing one to control a variable's initial value, or the value of a parameter or constant. Adjusting the slider of an integral (or stock) variable while the system is running actually adjusts the present value of the variable. The sliders can also be adjusted using the keyboard arrow keys.
Slider parameters are specified in the edit menu: max, min and step size. A relative slider means that the step size is expressed as a fraction of max-min.