Hi,
The CDK Fingerprint Similarity node has an undocumented feature when searching for the Max or Min Tanimoto similarity in that it returns a "Reference" column with the RowIDs which correspond to that Max or Min Similarity. This is a nice feature which other Fingerprint Similarity nodes in KNIME do not have, so it may be useful capturing this in the node dialog box.
See the post below which really helped James out.
http://tech.knime.org/forum/indigo/suggested-modification-to-fingerprint-similarity-node
I have noticed for Similarity ties, it separates the RowIDs with a | character. It may be more useful to have the "Reference" column as a Collection Type column so that the user can manipulate the list of RowIDs better (i.e. using UnGroup node or Split Collection Column node).
Thanks,
Simon.