Concurrent access to the one and only bean instance can be controlled by the container (Container managed concurrency, CMC) or by the bean itself (Bean managed concurrency, BMC).

Some Logo implementations, particularly those that allow the use of concurrency and multiple turtles, support collision detection and allow the user to redefine the appearance of the turtle cursor, essentially allowing the Logo turtles to function as sprites.

See also Occam MPD References Gregory R. Andrews, Ronald A. Olsson The SR Programming Language Concurrency in Practice , ISBN 0 8053 0088 0 Stephen J. Hartley Operating Systems Programming The SR Programming Language , Oxford University Press, ISBN 0 19 509579 0 External links The SR Programming Language