The GIST (Genotype-IBD Sharing Test) is a method for detecting association between marker genotypes and IBD sharing at the same locus. Such an association will indicate that the marker itself, or one in linkage disequilibrium with it, could account for the observed linkage signal (at least partially). The software can be used to analyze affected sibship data.
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Li C, Scott LJ, Boehnke M. (2004)
Assessing Whether an Allele Can Account in Part for a Linkage Signal: The Genotype-IBD Sharing Test (GIST).
Am. J. Hum. Genet. 74:418-431