fyi, twl_firm starts the ds/dsi game by loading the .app and shit. nothing of this is done under native_firm, so everything is "rebooted" (firmlaunch). MSET doesn't boot any app, however they ask NS to launch a DS/DSi mode title, and NS will ask PM to firmlaunch and prepare boot config in memory for twl_firm to read the title id and stuff afterwards.
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3dbrew even explains that so...