The name iELANA stands for the electronic circuit analysis. iELANA is a useful tool for electronics professionals who are "on the road" with analog circuit techniques. If you want to analyze and optimize filter circuits, it is the right tool for you to judge the circuit behavior based on Bode diagram, Nyquist diagram and phase response. As an output quantity you can select one of open-circuit voltage, internal impedance, short-circuit current or internal conductance individually for each circuit.
iELANA operates according to the method of the dipole-reduction. What this exactly is you might not need to know exactly ... but you should know how to read a circuit diagram of electronic components and understand it so that you can feed iELANA with the necessary information.