The Select by Line/Polygon
button allow you to select features interactively.
Attention:
When commencing the point selection process before clicking on any of the
selection buttons you can use the Restart to clear the existing lines and start
over or use the Delete Last Point button to clear your last point. Once you
have clicked on one the selection buttons you can start over by clicking on the
select by line/polygon button again and then the Restart
button.