STRING allows you to create a polyline entity by 
indicating a series of points and stringing the vertices 
of the polyline to the desired shape.

Indicate the start position for the polyline, using a
Position Menu option. Note that "rubberbanding" occurs 
when the cursor is moved from the last indicated position.

Indicate the positions for each subsequent vertex in the
string.

End the polyline by choosing the BACK-UP option twice or
pressing <Enter> when the polyline is complete. When
storing the polyline, close its start and endpoints by
choosing YES from the next NO/YES menu. End the polyline 
at the current, specified endpoint by choosing NO.

When entering values, pressing the <Enter> key is not
accepted as a zero (0) assignment. Pressing the <Enter> 
key indicates that you finished creating a polyline.

In 2-D construction mode, the vertices are projected to 
the current construction plane, and the polygon is created
in the construction plane.

In 3-D construction mode, the polygon is created using the
3-D coordinates of the indicated vertices.
