Screen sharing

I would like to follow a web seminar in full screen on one monitor and do may own work in another screen. At times I would also like to share the entire screen on which I am working instead of just one terminal or one other application. In this way I can execute programs on the command line, open new windows, etc. and my peers can follow all I am doing while I still follow them. With sharing the entire screen this is not possible as I will double the horizontal width while keeping the vertical constant.

Is there a way to share just a particular monitor screen instead of all screens?

Dirk

What browser are you using? What is your operating system and in case of Linux, how did you configure your multi-monitor setup?

chromium or firefox
monitors: simply plug and play, monitors are set up side-by-side and not unified.