Hi,
I am developing widget which displays some information at the screen. The idea is that this widget should work in a background and when some interesting program is about to start it displays alert about this.
Sounds like you're describing
broadcast interactivity, which isn't available yet to developers.
So far I was able to find only one possibility to create this - using full-screen mode with pass-thru video, but in doc there is a mention that it is not supported on all platforms.
I'm currently gathering information about vendor support for this. Which vendors were you wondering about?
Are there any other ways to implement this functionality?
No
And whether is it possible to run my widget in this full-screen mode with pass-thru video and do any others widgets will be able to work simultaneously?
No, there is no widget-to-widget communication.