I'm looking for best approach - maybe some pre-made framework to make a desktop-client for web app /chat/
What I need is option to make an app displaying a web content with added functionality to display system notifications somehow /info-bubble from tray? alert window? flashing icon in tray?, ../ to notify there is something new requiring the response from user option to make it start on system start would be great.
So far the best approach I know about is Adobe Air - I know it can wrap a custom web app with predefined window size and html/url to load, and to make a "desktop icon" but I don't know if there is anything better? This requires the air to be available for the *.air installer, I'm looking for option to generate something stand-alone without next special pre-requisites.
Most important target is Windows XP/7, a possibility to export for OS X too would be a great advantage.
Adobe Air fits your requirements: