File name[24 characters] Index key [24 character part number] Printed page number [8 characters] Optional PDF page number if different [8 characters] I picked multiples of 8 for tabbing and it fits within 80 col. -- The only thing I'd suggest is if you want to include the file name, put it at the end, since filenames are pushing past 32 characters now as I put more descriptive file names up. <part number> <page number> <optional bookmark number> <optional filename> This obviously generalizes to: <keyword> <page number> <optional bookmark> <optional filename> 23 characters is probably adequate for <keyword> <filename> probably should be a URL, but that runs into problems with mirrors and all sorts of messy stuff when files move around in the heirarchy (sometimes groups of files get pushed down into new directories as more info on some topic shows up)