A method and apparatus for executing parts of a program process on two processors of a multiprocessor system. A home process resides in a home processor and is the destination process of all interprocess messages. The home process may call for the execution of a selected procedure on a remote processor. A call message is sent to the remote processor and a remote process is initiated. When the selected procedure has been executed in the remote processor, a return message is sent to the home process and execution of the home process is continued. Interprocess messages to the program process are received by the home processor and are forwarded to the remote processor. Interprocess messages generated by the selected procedure are transmitted by the remote processor, but are tagged with the identity of the home processor and home process.