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EMTP-like tools are widely used for simulation of transients in power systems. The implementation of several features in some of these tools has significantly expanded their applications. Some of them can be now used to perform sensitivity analysis, select power components, or introduce modifications in a power system during a simulation. This letter describes the new features. Although the document is based on the ATP version, the concepts can be also applied to other tools of the family. A very simple example is included to illustrate the scope of new applications.