How do I get code to run all the time? That is, not when an event occurs. I
have the following code that I'd like to use ...

Sub Volume()
If Sheets("Input").Range("Total_Vol").Value < 500 Then
PT_Yes.Enabled = False
PT_No.Enabled = False
PT_No.Value = True
End Sub

Is it possible (a) to run the code - i.e. will the syntax work and (b) to
run the code as a constant check and not as an event? PT_Yes and PT_No are
ActiveX OptionButtons.

Thanks for the help.