In mesh you can define a node at a certain point either by creation of a new node, by movement of the node closest to the point or by movement of any node to the point.
To create a mesh passing through a point:
From the Modification menu choose the Mesh through point item or click "Mesh to pass through a point" button in the toolbar.
The following dialog box shall appear:
See Also a sample TUI Script of a Mesh through point operation.