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The paper presents an overview of the current state of the art in a system-level electromagnetic compatibility (EMC) analysis technology called the discrete nonlinear analysis (DNA) and implemented in the “EMC-Analyzer” expert system. This technology is a fundamental evolution of a linear discrete EMC analysis; the last one was developed in the framework of the Intrasystem Electromagnetic Compatibility Analysis Program (IEMCAP). The DNA technology provides the following capabilities: 1) to model the radio transmission and reception in an extremely severe (up to 100 000 of modulated signals) electromagnetic environment (EME); 2) to consider both the linear effects (gain, attenuation, filtering) and the nonlinear effects of various types (intermodulation, desensitization, cross-modulation, reciprocal mixing, amplitude-to-phase conversion) and high orders (up to the order 25 and higher) in one common simulation procedure; 3) to carry out the EMC analysis quickly (the DNA’s computational advantage over traditional techniques grows rapidly with increasing EME complexity and with increasing order of the nonlinear effects); 4) to automatize the search of nonlinear interference sources.