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A method and system comprising a single IBM S/390 computer architecture running an OS/390 operating system, and at least two guest systems executing within the S/390 computer architecture. Each guest system comprising an execution space, allocated within the virtual memory space of the S/390 compute

A method and system comprising a single IBM S/390 computer architecture running an OS/390 operating system, and at least two guest systems executing within the S/390 computer architecture. Each guest system comprising an execution space, allocated within the virtual memory space of the S/390 computer architecture, in which a guest program or operating system may be executed. Each guest system is configured such that if a Start Interpretive Execution instruction in invoked, the instruction is interpreted and a corresponding function is performed in its place to simulate, for the guest program or operating system, the effect of the IBM S/390 computer architecture. Control is then returned to the guest system at the next instruction after the Start Interpretive Execution instruction, thus allowing the guest program or operating system to execute transparently.

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1. A system comprising a single IBM S/390 computer architecture running an OS/390 operating system, and at least two guest systems executing within the S/390 computer architecture, each guest system comprising an execution space within which a guest program or operating system may be executed, each

1. A system comprising a single IBM S/390 computer architecture running an OS/390 operating system, and at least two guest systems executing within the S/390 computer architecture, each guest system comprising an execution space within which a guest program or operating system may be executed, each guest system further characterized in that if a Start Interpretive Execution instruction is invoked, the Start Interpretive Execution instruction is intercepted and a corresponding function is performed in its place to simulate, for the guest program or operating system, the effect of the IBM S/390 computer architecture; whereby the guest program or operating system is able to execute transparently. 2. A method for executing at least two guest programs or operating systems each transparently on a single IBM S/390 computer architecture running an OS/390 operating system, the method comprising: establishing for each guest program or operating system the IBM S/390 computer architecture; intercepting an invocation by a guest system of a Start Interpretive Execution instruction; performing in the place of the Start Interpretive Execution instruction a corresponding function to simulate, for the guest program or operating system, the effect of the IBM S/390 computer architecture; and restoring control to the guest system at a point just after the interception of the Start Interpretive Execution instruction.