I’m looking for a way to visually mark or tag a window (any OS) so that it stands out.
A while back, I accidentally replaced a live production database containing thousands of records with an empty dev version, simply because the two instances of Enterprise Manager looked identical to one another. I’d like to avoid that in the future!
None that I’m aware of, but perhaps a virtual desktop system for your OS of choice would help keep the separation a little better for you.