This guide provides detailed instructions for updating internal databases using NCOALink® results. It outlines the importance of assessing business needs and data practices to effectively handle output data according to internal rules. The document explains how to manage input fields, including renaming conflicts with an Inp_ prefix, and emphasizes the use of address fields under the Best Address Data section. It details the implications of various flags in the opt_flags field, such as 'U' for appended apartment information and 'P' for proprietary change of address. The guide also describes how to interpret delivery point validation results, including the significance of DPV_Flag values and the identification of vacant addresses. Additionally, it discusses the importance of the Move Date and Move Type fields in determining the validity of address updates. The document concludes with recommendations for handling addresses that may not be deliverable, ensuring that businesses can maintain accurate and efficient mailing practices.