What can CST Design Studio do?

I browse the CST website. There is no enough introduction to this software. Anybody, who is aware of this issue, can shed a light. My interest lies in simulation of 3D EM problems.

Design Studio is for circuit simulation and planar EM projects.
For full-3D EM simulation you should look CST Microwave Studio...
However, Design studio can work with MW-Studio if 3D capabilities are required in your circuit...
mogwai.

CST Design Studio is useful for cascading S-parameters. Example always used is a high Q waveguide filter. By splitting the structure in half and simulating each, now non resonant, structure in MWS (quickly) you can cascade the results in Desing Studio to get the overall filter response.
Matt