Note that this reference documentation is identical to the help that is displayed in MATLAB when you type “help ft_trackusage”.

  FT_TRACKUSAGE tracks the usage of specific FieldTrip components using a central
  tracking server. This involves sending a small snippet of information to the
  server. Tracking is only used to gather data on the usage of the FieldTrip
  toolbox, to get information on the number of users and on the frequency of use
  of specific toolbox functions. This allows the toolbox developers to improve the
  FIeldTrip toolbox source code, documentation and to provide better support.
 
  This function will NOT upload any information about the data, nor about the
  configuration that you are using in your analyses.
 
  This function will NOT upload any identifying details about you. Your username
  and computer name are "salted" and subsequently converted with the MD5
  cryptographic hashing function into a unique identifier. Not knowing the salt,
  it is impossible to decode these MD5 hashes and recover the original
  identifiers.
 
  It is possible to disable the tracking for all functions by specifying
  the following
    global ft_defaults
    ft_default.trackusage = 'no'
 
  See the following online documentation for more information
    http://en.wikipedia.org/wiki/MD5
    http://en.wikipedia.org/wiki/Salt_(cryptography)
    http://www.fieldtriptoolbox.org/faq/tracking
 
  See also FT_DEFAULTS