Hi Craig,
I don't know if this will work in your system but, How about putting an editbox on a new form at 0,0? Make the form larger than the editbox and set the forms scrollbars to Both. The form will float, not be contained in some other form and you have to let the user close it (without a command button on the form!).
Aside from this little quirks, the effect seems to be what you want.

Good luck,
Julian