Using VBA code to interact with or interrupt an external macro

[TishyMouse]

I have a macro that is calling another macro in an external workbook (created by a third party so I don't have access to the macro source code). The external macro currently executes and finishes by displaying a 'Done' message box. Is there any way for me to (a) suppress the message box OR (b) pass a command to simulate pressing 'OK' on the message box OR (c) interrupt the external macro at this point?

Excel 2016 on Windows

[TishyMouse]

NOte this is cross-posted to https://social.msdn.microsoft.com/Fo...forum=exceldev as I'm not sure of the right site to use. Apologies if this is not correct practice!

[TishyMouse]

Answered at https://social.msdn.microsoft.com/Fo...forum=exceldev