on this link maintained by the federal police more details are available on obtaining the Cédula de Identidade de Estrangeiro - cie, also called Carteira de Identidade do Estrangeiro.

This will start the process for obtaining other official documents including the Carteira de Trabalho - ctps (work-permit for foreigners) which allows the ability to obtain legal employment anywhere in the country.

more information on the Registro Nacional de Estrangeiros - rne can be obtained directly on the government site via this link.