nqsub can only be run on PE0 but your batch jobs will be running on
PE1 to PE12. Hence self-submitting jobs will have rsh to vpp00 to run
nqsub, i.e. the self submission line looks something like:
rsh vpp00 "cd $QSUB_WORKDIR; \
nqsub -P a99 -q $QSUB_QUEUENAME -lM $MEMLIM $QSUB_REQNAME"