SAPO (SIGAPO) is an acronym for "Sistemas e Aplicações de Processamento de Dados Online." It is a type of computer system designed for online data processing. Developed in the 1970s by the Portuguese company INESC (Instituto de Engenharia de Sistemas e Computadores), SAPO is notable for being one of the early examples of a system that facilitated real-time data handling.
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