All the files in this directory contain the same paper that was presented at the Macromolecular Crystallography Computing School held at Western Washington University in Bellingham, Washington USA on August 17-23, 1996. The files differ in the format of the paper and the file compression method. The files that have "ps" in their names are in PostScript format, and the two with "pdf" are in Adobe Acrobat format. These latter two require Adobe's free Acrobat Reader, which may be downloaded from ftp://ftp.adobe.com in the directory /pub/adobe/Acrobat, for reading and printing. The files with the .pdf and .ps extensions are not compressed. The files with the .gz extension require the utility gzip for uncompressing, which is available at ftp://gatekeeper.dec.com in /pub/GNU. The file with .sit.hqx requires unstuffit (or equivalent) on a Macintosh.