The values of this field are shown in the following list:
PRTYS_PROCESS
All the threads of any process.
PRTYS_PROCESSTREE
All the threads of a process and any descendants. The indicated process
must be the current process or a process created by the current process.
Detached processes may not be specified. The indicated process may have
terminated.
PRTYS_THREAD
A single thread of the current process.