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here's a tutorial:
http://www.4thefort.com/modules/sections/index.php?op=viewarticle&artid=12
here's another one:
http://www.unixoops.org/modules/wfsection/
http://www.4thefort.com/modules/sections/index.php?op=viewarticle&artid=12
here's another one:
http://www.unixoops.org/modules/wfsection/