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Typically, this refers to a java script-based  calculator page named “enzan.html.” For instance, one example shows a page where number buttons invoke a JS function enzan('tasu'), enzan('hiku'), etc., implementing addition, subtraction, multiplication, division, and other functions like sin, cos, log, and power

In contrast, enzan.cgi refers to a cgi script (likely in Perl or another language run on a server) that processes input from an HTML form and returns computed results.