4PT 1S (4 points, 1 slope) allows you to create a conic
based on the positions for four points on the conic, and 
the slope of the conic at one of the indicated points.

Indicate the start point of the conic, using a Position 
Menu option.

Indicate the second point of the conic, using a Position
Menu option. 

Indicate the third point of the conic, using a Position 
Menu option.

Indicate the end point of the conic, using a Position 
Menu option.

A slope must be assigned to one of the four indicated
points. You are prompted to key-in the point number for 
the slope.

To assign the slope that you define to the start point,
press <Enter>. To assign the slope that you define to
any of the other indicated points, enter the desired point
number and press <Enter>.

Define the slope of the conic at the selected point, using
the procedures for defining the slope found in the 
Geometric Modeling section of the CADKEY User Reference
Guide.

If a conic cannot be created, and error message is
displayed. You are prompted to press <Enter> and to 
redefine the conic, beginning with the position of the 
start point.

In 2-D construction mode, the indicated points and the 
slope are projected to the current construction plane. The 
conic is created in the current construction view, at the 
depth that is active when the slope is defined.

In 3-D construction mode, the conic is created in the
plane that is defined by the first three indicated points.
The endpoint and the tangent vector are projected to this
plane.
