Abstract: This invention provides a system for the prevention of the spread of a computer virus by intercepting outgoing messages from a computer device and determining whether the message is of an acceptable type. The system is provided as a firedoor that compares outgoing messages to a previously established list of approved actions and, if the message does not conform to an approved action on the list, the firedoor blocks transmission and prevents the virus from spreading any further. If a further embodiment, multiple firedoors are applied in a cascaded series to compare the transmission to different acceptance criteria in tandem.

Abstract: A computer system comprises plural single board computers that utilized shared physical storage. The computers boot from and run applications located remotely. In a preferred embodiment, a hierarchy of such computers is utilized, and the order in which they boot is set such that an optimum sequence is achieved. The computer bus serves as both a network for intercomputer communications, and a bus for intra computer communications.