The Free On-line Dictionary of Computing (30 December 2018):

Selective Dissemination of Information

    (SDI) (From Library Science) SDI is a current
   awareness system which alerts you to the latest publications
   in your specified field(s) of interest.

   A user registers at such a system with keywords representing
   his or her fields of interest, called a search profile.  When
   new publications matching the search profile appear, the
   system informs the user of them instantly, periodically or
   upon request.  Some systems may also be able to inform the
   user if changes in already notified publications occur.

   Health Science Library SDI
   (http://www-hsl.mcmaster.ca/sdi.html).  FIZ Karlsruhe
   Scientific Service Institution
   (http://fiz-karlsruhe.de/mc-sdi.html).

   (1997-03-10)