Systemic is a research project designed to search data for extrasolar planets using amateur astronomers.
The data set is the radial velocity derived from doppler measurements of the star (or similar object) over time.
Any radial velocity is presumed to be from the gravitational tug(s) of possibly multiple bodies who combine to create the specific data curve.
The reason the program has to manipulated by the user is that the complexities of multi-body orbits are not solvable to unique answers.
Results one obtains can be uploaded and are analyzed independently for goodness of fit and stability and are posted among the proposed solutions for that system.