'handle' command

I have inherited a club record system from a deceased member which I am trying to unpick. I have managed most of it but there is a command which I am unfamiliar with. On the Switchboard he has a series of buttons which call various forms, reports and macros using a command called '=HandleButtonClick(4)' where the number represents that button on the list. Is this a VBA command? Is there a way to discover where in the code is this instruction

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