[dba-Tech] setting the top most display window

I have a terminal that is acting as a kiosk to display a marketing web page
based slide show.

I have everything working except if there is some annoying error message
that pops up on the host machine. It pops up over the display. Is there a
way to set that user's session to not allow system errors to display? Or
another thought, to set Internet Explorer to be the topmost priority display
so that the errors wouldn't go on top of it?

TIA
John B