Abstract: When a request processing unit 2a receives processing request including memory access, it executes processing in accordance with the request, and when memory access takes place, it outputs access request to address designated by the processing request. A memory access proxy unit 2b sets memory protection information 1a of object 1 at a memory management unit 3a to output memory access instruction to a processor 3. The memory management unit 3a generates exception when memory access instruction from the memory access proxy unit 2b is access except for area set as memory protection information 1a. Thus, it is possible to carry out, at high speed, with high reliability, memory access such that, in accordance with request of an object, other object executes.

Abstract: A higher speed of a data transfer process is realized when a module is downloaded from a server to a client.

Abstract: In a data communication method and apparatus, message communication within a complex object is executed in the same execution thread, and a history of message communication is updated to indicate message communication from the same execution thread. In message communication directed from within a complex object to an external object, a message or messages are temporarily stored on a destination-by-destination basis. When message processing completes, the history of message communication is checked, so that the stored message or messages are transmitted in a single message communication operation.

Abstract: A data processing method for use with a plurality of exception processing environments executes an application program on which an object to be supplied with an error message upon occurrence of an exception event which is likely to cause interruption of the normal execution of the application program is previously registered. If an exception event occurs occurred, an exception occurrence message indicating occurrence of the exception event is sent to a pre-set object. The pre-set object supplied with the exception occurrence message, generates an error message corresponding to the exception event indicated by the exception occurrence message and sends the generated error message to the registered object. The registered object sends a message commanding execution of a pre-set process corresponding to the error message to the application program associated with the exception event.