Steverino -
Assuming you're using Visual Basic, you can do something like this:
Dim Line As CWIMAQLine
Set Line = CWIMAQViewer1.Regions(1)
Then you can access the start and end of the line with Line.Start and Line.End in the usual way.
Greg Stoll
IMAQ R & D
National Instruments
Greg Stoll
LabVIEW R&D