Abstract: A multi-processor computer system executes a single-thread program having a plurality of callable procedures. The local memory of each processor contains a program stack, the object code of each procedure that executes on that processor, and an agent object. In addition, the local memory contains a c-stub module for each procedure executable on a different processor, and a s-stub module for each local procedure that can be called by a remote procedure. When a procedure P1 executing on processor A calls a procedure P2 which executes in processor B, it issues a local call to P2's c-stub in processor A's local memory. The P2 c-stub then invokes the agent process in processor A, which communicates with a corresponding agent process in processor B. The agent process in processor B causes P2's s-stub in processor B to issue a local call to procedure P2. The return from a procedure follows the same path in reverse.