An apparatus for a network of computers is presented. A plurality of inner firewalls operate within a personal computer. The personal computer operates in a network of computers and includes at least one microprocessor and at least two memory components. The plurality of inner firewalls deny access to a first memory component of the personal computer by another computer through a network connection with the personal computer during a shared operation. The plurality of inner firewalls also allow access to a second memory component of the personal computer by the other computer through the network connection with the personal computer during the shared operation.