1. [n]  (informal) the application of maximum thrust; "he slammed the throttle to the firewall"
2. [n]  fireproof (or fire-resistant) wall designed to prevent the spread of fire through a building

Firewall
With assassins from several intelligence agencies hot on his trail, ex-CIA agent Bruce Tucker searches for Monica Fox, the woman who holds the key to the Ultimate Encryption--a code that will launch the missiles of all the world`s nuclear powers.

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1. firewall code.

2. firewall machine.