This panel is a Calculator inside Adobe Fireworks.
Drop the .jsf or .swf file into the Commands (or Command Panels) folder then run the command or if you have a mxp file, double-click the mxp and installation is automatic.
Figure 1: Calculator
You can use the x,y,w & h buttons to grab information from the selected object/s on the canvas. X and Y gives the position horizontally (x) and vertically (y) of the selected object, its width (w) and its height (h).