Tom,

There is perhaps a better way to approach my problem. A one time
pop-up would be great, and without an OK button if I could make it
remain for approximately 10 seconds. It would not need to repeat
itself. The next message would pop-up only if there were to be a
change in the A1 value.

Also, assuming there would be an A1 type of construct in multiple
worksheets, would there need to be more than a single UserForm?

Thanks,

Michael