The latest version of the FEE64 software Interface document ( May 2016 ) is available as a .pdf from
http://npg.dl.ac.uk/documents/edoc000/#AIDA. EDOC955

The version available via the pink "documentation" button in the Control browser window is now out of date. This
will be updated at some future time.

Other documents that are of use are there also.
MACB specification.
GREAT Data Format.