/KERNEL_THREAD_LIMIT=n

    Changes the limit of the number of kernel threads that can be
    created in the process. If the value specified is higher than
    the SYSGEN parameter MULTITHREAD, an error message is returned.
    Specifying the value 0 makes the process use the systemwide
    limit set by the MULTITHREAD parameter.

    Per-process kernel thread limits can be controlled using one
    of the following DCL commands:

       $ SET PROCESS/KERNEL_THREAD_LIMIT=n
       $ RUN/KERNEL_THREAD_LIMIT=n
       $ SPAWN/KERNEL_THREAD_LIMIT=n