> 6. When you click a button "Start" LibreCAD placed in a position of  memory
> all modified primitives with its information. It is ilustrade with the
> following example:
> If we have a line from 0, 0 to 10, 1 and a circle of center in 15, 1 and 10
> radius we want to cut respectively 20W and 50W, memory information will be
> placed in the following
> line 0 0 10 1 20
> circle 15 1 10 50
> 7. Below LibreCAD open another application developed in C language This
> application has the characteristic of being developed as a real-time
> application which took control from now on.
> 8. This will read the data from the machine specifications and data for each
> of the primitives located in memory, will make the process of generation of
> trajectories (interpolation) of the current primitive and will result in the
> number of steps to be taken each step-motor the next millisecond.
> 9. The numbers of steps of each step-motor and the power of the laser is
> sent via USB to a card of control that read the data received and
> transformed into pulses to send drivers for stepper motors each axle and
> Power Controller laser.
> 10. 8 and 9 will be repeated until it is finished cutting all the
> primitives.
> This is what the system should do. As you said LibreCAD actually be only one
> user interface. Hard work will the application developed in C.