Three files are used to enable edx and index to communicate. For a directory named EXAMPLE, the following files are automatically created:

1. .EXAMPLE.img.ref - full, absolute URL of the icon image for that directory.
   
   
2. .EXAMPLE.img.thumb - full, absolute URL of the thumbnail for that image
   
   
   
3. .EXAMPLE.thumb - file containing, at present, a relative path to the thumbnail. But it should be an absolute path to the file or in the case of a b64 thum, the base64 dataitself should be in the file.
   
   

.EXAMPLE.img.ref is:

• written by mkdir/do_cel when finding a thumbnail for the icon

And is read by:

• index (for killifish domains/sites)
• as the species thumbnail for http://i.killi.es
• as well as by the genus listing app.

.EXAMPLE.img.thumb is written by edx at the same time as .img.ref is being generated by edx do_cel. It is also generated by index

.EXAMPLE.thumb is written by and read by