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variable_names, but allows for history substitutions. read_history/6 is used by the top level to read the user's actions. Show is the command the user should type to show the saved events. Help is the command to get an overview of the capabilities. Special is a list of commands that are not saved in the history. Prompt is the first prompt given. Continuation prompts for more lines are determined by prompt/2. A
%win the prompt is substituted by the event number. See section 2.8 for available substitutions.
SWI-Prolog calls read_history/6 as follows:
read_history(h, '!h', [trace], '%w ?- ', Goal, Bindings)