When included in the "ThisWorkbook" Module, this code does caused the named
procedures to run when the described keys are pressed. Furthermore, when a
subroutine in that module runs, this code causes an error message stating:
"Only comments may appear after an End Sub, End Function, or End Property".
Does that mean that this code needs to be included in a subroutine?

Application.OnKey "%{LEFT}", "ShiftLeft"
Application.OnKey "%{RIGHT}", "ShiftRight"

Thanks,

Keith