WITNESS allows you to create witness lines when you want
to create dimensions or labels using separate text and
witness line entities.

Create witness lines by choosing one of the following
options:

ENDPTS  - to create a witness line on the screen by 
          defining the start and endpoints.

STRING  - to create a string of witness lines by assuming
          that the endpoint of one line is the starting
          point of the next.

PARALEL - to create a witness line parallel to a 
          previously created line through a specified 
          point.

PERPEND - to create a witness line from a designated point
          to an existing line entity so that the new 
          witness line and the existing line are 
          perpendicular.
