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A firewall is a program that restricts unauthorised access to a computer or network. When it was discovered that the digitally ascended Asurans were on their way to Atlantis, Richard Woolsey asked if a firewall would prevent their access to the computer systems, however Dr. Rodney McKay stated that the Asurans just pop in and out of subspace, he decided instead to create an anti-virus software to contain them. (SGA: "Ghost in the Machine")