Specifies the processor affinity for all processes associated with the job. The affinity of each thread is set to this value, ...

Specifies the processor affinity for all processes associated with the job. The affinity of each thread is set to this value, but threads are free to subsequently set their affinity, as long as it is a subset of the specified affinity mask. Processes cannot set their own affinity mask. Ignored unless LimitFlags specifies Limit Affinity.