A computer or microchip including a network connection for connection to a public network of computers including the Internet, the network connection being located in a public unit; and an additional and separate network connection for connection to a separate, private network of computers, the additional network connection being located in a protected private unit. An inner hardware-based access barrier or firewall is located between and communicatively connects the protected private unit and the public unit; and the private and public units and the two separate network connections are separated by the inner barrier or firewall. The protected private unit includes at least a first microprocessor and a system BIOS located in flash memory. The public unit includes at least a second or many microprocessors separate from the inner barrier or firewall. The inner barrier or firewall comprises a bus with an on/off switch controlling communication input and output.