- return oinstance from headerSetInstance(). - use headerGetInstance() consistently.
- return oinstance from headerSetInstance().
- use headerGetInstance() consistently.

devzero2000/RPM5,devzero2000/RPM5,devzero2000/RPM5,devzero2000/RPM5,devzero2000/RPM5,devzero2000/RPM5,devzero2000/RPM5