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You'd need to create an OS Command to run the external program; see https://wingware.com/doc/oscommands for how to create an OS Command.

Then you'd need to create a toolbar button to run the OS Command. Extra toolbar buttons may be added through the User Interface > Toolbar page of the Preferences dialog. The command to use is execute-os-command(title="<title>") where <title> is the title of the OS Command.