1. A multi-level security apparatus for processing a plurality of different classification levels of information, the apparatus comprising: a plurality of processors configured to collectively process information simultaneously at a classified level of information and an unclassified level of information; a data interconnection configured to interconnect the plurality of processors; a first card having a first key connected to the data interconnection and to a first processor of the plurality of processors, wherein the first processor is configured to communicate with the data interconnection through the first card; a second card having a second key connected to the data interconnection and to a second processor of the plurality of processors, wherein the second processor is configured to communicate with the data interconnection through the second card; a processing module configured to be in communication with the first card and the second card through the data interconnection for reallocating said first and second processors from processing said unclassified level of information to said classified level of information, the processing module comprising an information security module with a guard function configured to allow information to be passed in an unrestricted way from an unclassified side of the apparatus to a classified side of the apparatus.