When a straight segment is selected, a filled square is displayed. When a curved segment is selected, the Direction Handles and Lines for the segment are displayed, along with a filled circle.
Straight segment selected
Curved segment selected
When a control point is selected, it displays a square when the previous segment is straight and a circlewhen the previous segment is curved.
Press Tab to move to the next point, or Shift+Tab to move to the previous point.
Hold Shift and click other segments to select multiple segments or points.