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

Concurrent CLU

    A programming language extending CLU for
   concurrent processes, developed by by Hamilton in 1984.

   ["Preserving Abstraction in Concurrent
   Programming", R.C.B.  Cooper, K.G. Hamilton, IEEE
   Trans Soft Eng SE-14(2):258-263, Feb 1988].1

   (2013-09-28)