Another one inspired by a question in the TurboCAD user forum. TurboCAD does
not provide you with the means to insert a new vertex (node) into an existing
3D polyline. This macro will help you to do it. After selecting a line (it
works for 2D polylines (with no arc segments) as well as 3D polylines) and
running the macro, a form is displayed with a list box containing items
representing each pair of vertices in the line. You select one pair of
vertices, click the "Insert" button, and a new vertex is inserted
midway between the selected vertices.