Abstract: A method for isolating a computer platform includes receiving a service request from an external requestor via a network at processing circuitry associated with a hardware barrier between the computer platform and the network, causing the service request to be loaded into a first buffer having a dual port connection to a corresponding second buffer of the computer platform, providing an indication to the computer platform to indicate the service request is loaded into the first buffer to be pulled into the second buffer of the computer platform, responsive to processing of the service request by the computer platform, receiving a message indicating a response loaded in the second buffer has been pushed to the first buffer, and communicating the response to the external requestor. The buffers form the only access point to the computer platform. The indication is the only communication initiated from the external requestor that crosses the hardware barrier without control by the computer platform.

Abstract: A method for isolating a computer platform includes receiving a service request from an external requestor via a network at processing circuitry associated with a hardware barrier between the computer platform and the network, causing the service request to be loaded into a first buffer having a dual port connection to a corresponding second buffer of the computer platform, providing an indication to the computer platform to indicate the service request is loaded into the first buffer to be pulled into the second buffer of the computer platform, responsive to processing of the service request by the computer platform, receiving a message indicating a response loaded in the second buffer has been pushed to the first buffer, and communicating the response to the external requestor. The buffers form the only access point to the computer platform. The indication is the only communication initiated from the external requestor that crosses the hardware barrier without control by the computer platform.

Abstract: The present invention consists of an investment casting process that makes use of a frangible low-strength investment material mold and a mold removal solution to facilitate the removal the investment material mold from the casting. The mold removal solution is a liquid that permeates the mold material and effervesces while inside the mold material, causing fracturing of the frangible investment material mold, and carrying away the resulting mold particles. The investment material compositions have the property of sufficiently decreasing in strength after cooling to facilitate the removal of the mold material by the removal solution. Two particular investment material compositions that possesses these properties are describe which contains powdered silica quartz, beta-hemi-hydrate calcium sulfate (gypsum), a hardening agent of potassium sulfate, and water. A mold removal solution composition is described that is composed of hydrogen peroxide solution in water.