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No effect?

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I get the following error: DI_NOEFFECT The operation had no effect. This value is equal to the S_FALSE standard Component Object Model (COM) return value. On this code:
		returnValue = this->pDevice->GetDeviceData (sizeof(DIDEVICEOBJECTDATA), pBuffer, &this->CurrentObjectsAmount, 0); // <=Error return value
		if (returnValue == DIERR_INPUTLOST || returnValue == DIERR_NOTACQUIRED)
			GlobalErrorWrap::HandleDirectInputError (this->pDevice->GetDeviceData (sizeof(DIDEVICEOBJECTDATA), pBuffer, &this->CurrentObjectsAmount, 0));
			GlobalErrorWrap::HandleDirectInputError (returnValue);
What does this error means? It happend after I return from an Alt-Tab. Althoug upon restore I do acquire before reaching this method again. Should I just ignore this error or try to acquire the device? Thanks in advance.

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