STRING allows you to create a series of line entities by
assuming that the endpoint of one line is the start point
of the next line.

Using a Position Menu option, indicate the start point of
the first line.

Note that "rubberbanding" occurs when you move the cursor 
from the start point. A series of lines can be drawn from
this point by specifying endpoint positions, using the
Position Menu.

In 2-D construction mode, all points are projected to the
current construction plane, and the line string is created
in the construction plane.

In 3-D construction mode, lines are created using the 3-D
coordinates of the indicated points.
