Starting Point for Curves in Rhino

[CrossbowMarty]

I am building a curve by connecting several Polylines together. My problem is that I cannot seem to select which of the points will be used as the start.

There is the Curve -> Point Object -> Mark Curve Start menu option but this does not seem to do anything.

Does anyone know how to specify which point on a closed curve is the starting point?

I need to specify this as the file saved to .DXF is being loaded into my (homebuilt) CNC hot wire foam cutter and it starts it's cut on the first point in the curve.

[SEANT]

The CrvSeam command (Curve > Curve Edit Tools > Adjust Closed Curve Seam) allows relocating a seam on a polyline, or any curve for that matter. When the command is started, an arrow is placed at the current startpoint, pointing in the polylines direction. Click and drag that to the desired startpoint. The ‘Flip’ sub-option will change the direction of the polyline.