ALONGC allows you to segment a curve by creating one point
on the curve at a specified distance from a selected
endpoint.

Enter the desired distance and press <Enter>, or press
<Enter> to accept the default value of 1.00.

Select the curve near the desired endpoint.

If the specified distance is greater than the length of 
the curve or less than .00005, an error message is 
displayed. You are prompted to press <Enter> and to enter 
a new distance.

If the specified distance is valid, the point is created
automatically.
