Introduction - If you have any usage issues, please Google them yourself
Detailed descriptions of the theories and formulations behind these codes can be found in the three-volume book Scattering of Electromagnetic Waves published by John Wiley & Sons:
Volume I: Theories and Applications (2000)by L. Tsang, J.A. Kong, and K.H. Ding
Volume II: Numerical Simulations (2001) by L. Tsang, J.A. Kong, K.H. Ding, and C.O. Ao
Volume III: Advanced Topics (2001) by L. Tsang and J.A. Kong