1. For use in a multiprocessing system wherein a number of processors share a common storage means, said storage means providing the means for storing a number of access descriptors which represent one of said processors as a processor object, one of said access descriptors (process object access descriptor) providing access to a process object for storing process object access descriptors for describing the type and the extent of access to system objects (including a buffered port system object) associated with a process to be executed on said one of said processors, a first one of said access descriptors containing information providing access to said buffered port system object, and a second one of said access descriptors (message access descriptor) representing a message as a system object; the improvement in said one of said processors comprising: first means for registering first access information, said information providing access to said processor object stored in said storage means, said first means initially being loaded with said first access information; second means for registering second access information, said information providing access to said buffered port object stored in said storage means; third means for registering third access information, said information providing access to said process object stored in said storage means, said third means initially being loaded with said third access information; control means, connected to said first, second, and third means, and to said storage means, capable of responding to an instruction of said process, for using said first access information to fetch said process object access descriptor, said control means including means for loading third-access information developed from said process object access descriptor, into said third means for registering, means for using said third access information to fetch said one of said access descriptors containing information providing access to said buffered port system object, means for loading second access information developed from said one of said access descriptors into said second means for registering, means for using said second access information to access said buffered port object, and means for moving said message access descriptor from said process object to said buffered port object; whereby said processor provides the means for utilizing said buffered port system object for queuing said message access descriptor for a message to be paired with a process.