Appeal No. 2001-1206
Application No. 08/588,942
particular program, work in progress by the primary operating
system is temporarily suspended, but not terminated, wherein the
software state of the computer system is saved until a subsequent
restoration of the primary operating system, after running of the
program by the secondary operating system. This is made possible
by the use of a “shell” from which the program in the secondary
operating system is executed, constraining the secondary
operating system such that another program cannot be invoked
under the secondary operating system until after control is
returned to the first operating system.
Representative independent claim 1 is reproduced as follows:
1. A method within a data processing system for executing a
program under one of a plurality of mutually exclusive operating
systems, said data processing system having a nonvolatile mass
storage device, a volatile memory, and a processor, said method
comprising:
in response to invocation of a program which executes under
a second operating system among said plurality of operating
systems while said processor is executing a first operating
system among said plurality of operating systems, automatically
performing the steps of:
causing said data processing system to achieve a quiescent
state;
determining a state of said first operating system from
contents of said volatile memory;
storing said state of said first operating system within
-2–
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