The pictures of structures and some of the highlighted text act as hyperactive links to binary input files for the coordinates of the structure. These coordinates can be automatically sent to the program CrystalMaker.
Then in CrystalMaker you will able to manipulate the structure, to rotate it and to view it in a variety of modes.
CrystalMaker is the program that was used to generate the pictures in the text, which in some cases were further annotated with another Graphics package.
If you have the free Demo version of CrystalMaker loaded on a Macintosh or PowerMacintosh computer you can set your Internet Browser through the Helper Applications preferences to recognise files with a .cmdf extension as CrystalMaker binary files and to automatically load the structure file for viewing when you click on one of these links.
You will need to set the browser to expect the MIME type of these files to be chemical/x-cmdf. Having located your copy of CrystalMaker you must set the file type that your browser believes it is delivering as "CMDF" (this is not the default file type displayed which will be "Text").
Instructions for setting your Browser for Chemical MIME types, with the example of .pdf files, are contained in a document http://www.chem.ox.ac.uk/icl/molecules.html