• Points can be added to the already selected points data by holding down <Ctrl> whilst selecting (click) with the mouse. Reselecting an already selected point using <Ctrl>+click, deselects the point.

• The mouse can either be clicked to select a single point, or clicked and dragged to define a selection box. Selection settings are  controlled from the Data Selection area on the Points and Strings tab of the Project Settings dialog (accessed using ).

Data selection is further controlled by the settings in the Snapping toolbar and the Overlay Selection dialog.