Retrieving the selected anchor points coordinates.

I have read the scripting guide,

and learned about finding coordinates this way:

var aDoc = activeDocument;

var topObject = aDoc.selection[0];

var coord = topObject.pathPoints[0].anchor

alert(coord[0])

I'm wondering how you would find the coordinates of a selected anchor point.

For example: You make a hexagon, and then click on a single anchor point with the direct select tool.

I want the script to know the coordinates of that anchor point.

I'm using javascript and CS5.

Thanks!