This paper introduces ERIC searchers to the use of clearinghouse codes as search keys and includes a brief history of ERIC Clearinghouses, information on how codes are assigned, the use of clearinghouse codes in the WISE Search Program at the University of Wisconsin-Madison, and some examples of potential uses of codes in searching. Examples in this paper are specific to the WISE Search Program; however, the concepts can be transferred to any ERIC retrieval service that has Clearinghouse Accession Codes as a searchable field. Accession codes and scope of interest notes for ERIC Clearinghouses are appended. (Author/CWM)