Dear Colleagues -- The on-line OOF2 manual has been updated for OOF2 version 2.1.1, and can be found at http://www.ctcms.nist.gov/~langer/oof2man/. A tar file containing all of the html pages, suitable for reading off-line, is at http://www.ctcms.nist.gov/oof/oof2/oof2man.tgz. The chapter on writing OOF2 extensions is still out of date. Please contact us at oof_manager@nist.gov if you need advice about extending OOF2. Sincerely, Steve Langer Andrew Reid Valerie Coffman Gunay Dogan