If this box is checked, then all new submissions will need to have a reciprocal link on their website before they can submit their website to your directory. That is, the application will check the URL they place in the "Reciprocal URL Location" field at the time of submission to find the link. It also means that the Link Management Assistant will periodically check that these links continue to exist. If you just want to use this application to run a standard directory, you can leave this box unchecked. If unchecked, all of the additional reciprocal link related features here become irrelevant.