1. An apparatus, comprising: a plurality of inner firewalls configured to operate within a personal computer, said personal computer being configured to operate in a network of computers, said personal computer including at least one microprocessor and at least two memory components, said plurality of inner firewalls being configured to deny access to at least a first memory component of said personal computer by another computer through a network connection with said personal computer during a shared operation, and said plurality of inner firewalls being configured to allow access to at least a second memory component of said personal computer by said another computer through said network connection with said personal computer during said shared operation.