Glass-Steagall was enacted in 1933 to create a firewall between commercial and investment banks: commercial banks could not underwrite or deal in securities, and investment banks could not accept deposits.

FORBES: Why The Glass-Steagall Myth Persists

No single person knew the whereabouts of all the documents, in order to create a security firewall.

BBC: Warsaw Ghetto: The story of its secret archive

The near-term measures that need to be approved by the summit are no secret: reduce Greece's mountainous debt, recapitalise vulnerable banks and create a credible firewall to protect endangered but still-solvent countries like Spain and Italy.

ECONOMIST: Charlemagne

He tabled a series of amendments to the bill aiming to create a "failsafe and a firewall against any attempt by the judiciary to interfere with the sovereignty of this House".

BBC: European Union Bill part one