The demo file ('DEMO.BAP') contains some predicates that can be called from the shell, presenting solutions to standard Prolog exercises (fib, factorial).
The take_time predicate times the execution of its argument.
Calling take_time (queens(8)) will open a window, execute queens in it and display the execution time.
Use clock(Time) to display the current time of day obtained from the server.
The call clock (start) will start a clock running independently in an infinte loop, displaying the current time.