In an attempt to fill a gap between fully automatic search/match programs and purely manual methods based on paper products, a relational database plug-in has been developed that functions as a PC-based Search/Index program for extracting information from PDF-4 powder diffraction databases. The plug-in provides an adjustable search window and match window to account for experimental errors. Both Hanawalt and Fink search methods are incorporated. In this paper, we report search-indexing results obtained with the new PDF-4 plug-in applied to a new relational database, the PDF-4/Organics 2003. This database has 24 385 experimental entries and 122 816 calculated patterns derived from the Cambridge Crystallographic Database. We introduce a goodness of match (GOM) parameter to describe the relative agreement between the experimental input data and selected reference patterns from the PDF-4/Organics 2003. The relevance of the GOM is illustrated in several example problems. Multiphase samples can be treated on a phase-by-phase basis.