Example 4: The Root Object
This sets the object that will be returned from a call to SE_GetRootObject().
The Root Object must be a Transmittal Root Object.
If the root object was set previously, then the old root object is returned in old_root_object.
SE_STATUS_CODE_ENUM SE_SetRootObject
SE_TRANSMITTAL transmittal,
SE_OBJECT new_root_object,
SE_OBJECT *old_root_object