CHAIN allows you to select a series of connected lines, 
splines, and/or arcs by defining the start and end 
entities in the chain and the direction in which you 
want the chain to be selected.

Select the start entity in a desired chain of entities.

Indicate the direction of the chain using the cursor. 
When more than one direction is possible, indicate the 
entity you want as the next chaining entity.

The end of the connecting entities is determined in one of
three ways:

- If you select the desired end entity.

- If you press <Enter> to select all connected curve
entities until a break is found in the chain.

- If a portion of the chain progresses off the screen 
display, the last entity completely displayed on the 
screen is designated as the end of the connecting 
entities.

The chained entities are selected from the designated 
start to end points.

Accept or cancel the selection by choosing from the following options: 

YES - to accept the entities selected in the chain and 
begin the selection process.

NO - to cancel the selections and reselect the chain of
entities.

You are returned to your place in the function.
