Cory,
Perfect!! Thanks for coming back so quickly!!!
As the base excel program is fully automated and runs throughout the day, it does not require a 'user' and therefore typing to activate (shortkeys) is not suitable.
I searched for 'MeProc.exe' to find the solution and used method below (ME file Test1):
Sub CallMEMacro()
Shell ("C:\Program Files (X86)\Macro Express Pro\MeProc.exe /ATest1")
End Sub
Thanks again
Ken