A slider for the Xfce panel that can be used to adjust and/or monitor any numeric variable. You set whatever “variable” this is by setting an adjust command which will run when the slider is clicked or scrolled. An option is provided to pass the value of the slider (the fraction times an adjustable normalization factor) to the command. You get the value of the “variable” by setting a sychronize command. The command should return a numeric value and this value will be regarded as a fraction of a second adjustable normalization factor.