This handle is used to specify the process in OS-specific APIs.
On POSIX, this function returns a core.sys.posix.sys.types.pid_t
with the same value as Pid.processID, while on Windows it returns
a core.sys.windows.windows.HANDLE.
Once wait has been called on the Pid, this method
will return an invalid handle.
An operating system handle to the process.
This handle is used to specify the process in OS-specific APIs. On POSIX, this function returns a core.sys.posix.sys.types.pid_t with the same value as Pid.processID, while on Windows it returns a core.sys.windows.windows.HANDLE.
Once wait has been called on the Pid, this method will return an invalid handle.