Can lua be used for different programs like discord etc

It depends because different website uses different languages but some website you can use many languages to script something

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a macro is a tool that allows you to automate tasks and add functionality to your forms, reports, and controls. for example, if you add a command button to a form, you associate the button's onclick event to a macro, and the macro contains the commands that you want the button to perform each time it is clicked.