Advanced Squad Leader VASL Lesson.
Lesson 08: I go over how to use the LOS tool, how to set colors to indicate clear, hindered, or blocked LOS, how to turn on verbose mode to display additional LOS information, and the difference between normal LOS checks and Silent LOS checks.
1) Java - http://java.com
2) The Vassal Engine - http://vassalengine.org
3) The VASL module...