A line feature layer must be loaded into ArcMap in order to use this
tool. Select the line feature layer you wish to process from the drop-down box.
Select the desired metric, and press the OK button. Note that this tool treats
the line as the unit of measurement (i.e. it will generate one value per line). Your
lines must therefore be broken up into logical units before using this tool. This tool
will not calculate a roving window line metric (although such a tool will eventually
be added to Hawth's Tools).