screen capture

We have one computer at our client's site (and only one). She leaves her computer (Xp pro) and goes on break. About once over week, she returns. When she runs our green screen application, her default printer starts displaying the screen codes.

She logs off, closes accuterm, and logs back in and all is fine.

We have no screen savers nor lock out feature turned on. I'd like to blame this on user error, but I don't know what key strokes could be turning this on and how she might be doing it.

We do not have any scripts attached to function keys.

Any help would be appreciated