Build secure, dedicated company web app interfaces with no browser borders - Windows Shareware $99. of the day (motd) ... account status alerts ... frequent updates ... news feed ... make offers ... etc. Deliver your message uncluttered by ads or misclassified by spam filters.

Your message is browserless html: it appears without borders on user desktop. Add a transparent "drop-out" color to define non-rectangular showcase direct on desktop or hide entirely when there is nothing new. This is high-impact at user end, using your server-side web site programming to supply the content.