Para sacar el máximo partido a tu resumen digital, debes "instalar" y abrir el documento en aplicaciones que permitan la búsqueda indexada y la escritura digital:
Installing either (a) a tax software suite that contains an agenda module, or (b) a PDF reader/calendar integration tool to manage the summary file.
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This refers to the "Fiscal Agenda" or tax calendar, typically issued by government revenue agencies (like the Agenzia delle Entrate in Italy or Receita Federal in Brazil) to outline tax deadlines.