- The document provides an overview of the Lemur Toolkit, which is software for building search applications using language modeling techniques. - It describes how to install Lemur, index documents, run queries, evaluate results, and use the Indri query language. Parameters for indexing, retrieval, and formatting results are configured through XML parameter files. - Key functions covered include building indexes, running queries, evaluating results, and using the Indri query language to combine terms and restrict searches to fields. Smoothing and other language modeling techniques are also summarized.