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dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
biv = dt << Bivariate( X( dt:weight ), Y( dt:height ), By( dt:age ) );
// returns a list of bivariate objects:
// {Bivariate[], Bivariate[], Bivariate[], Bivariate[], Bivariate[],
// Bivariate[]};
biv << Fit Line; // sends the Fit Line message to
// each Bivariate object in the list
Suppose that you have a list of three control charts and you send a message (such as Save Interactive HTML) to the list. The message is sent to each member of the list in turn. First, it saves an HTML page with the first control chart; then it saves a second HTML page with the same name that contains the second control chart; and then it saves a third HTML page with the same name that contains only the third control chart. You end up with a page that contains only the third control chart.
obj << Save Interactive HTML( "Control Charts.html" );
Top Parent treats the first object as the single container:
tp = obj[1] << Top Parent();
tp << Save Interactive HTML( "Control Charts.html" );

Help created on 3/19/2020