[This is preliminary documentation and subject to change.]
The IWbemContext::DeleteValue method deletes a named context value created by IWbemContext::SetValue.
HRESULT DeleteValue(
  [in] BSTR bstrName,
  [in] LONG lFlags
);
 | WBEM_E_FAILED | General failure. | 
| WBEM_E_INVALID_PARAMETER | An invalid Name or lFlags value was specified. | 
| WBEM_E_NOT_FOUND | The specified named context value does not exist. | 
| WBEM_NO_ERROR | Success. | 
IWbemContext::SetValue, IWbemContext::GetValue