Comment 2 for bug 234061

I am new to separate X screens and only starting to understand the benefits/caveats of this approach.

To answer your questions:

1. No, it does not. Rescuetime is logging time on the application that has focus on that screen. The last application active on one screen before switching to the other seems to keep reporting as "active" while the other screen is being used.
2. No. Both instances report on the same screen. Rescuetime does not see the other.
3. The only way I can think of is the pointer. In fact, I was looking for a way to create a keyboard shortcut for switching from one screen to the other. All I found is a hint about how this can be done (http://gentoo-wiki.com/HOWTO_Dual_Monitors). Look for the Switchscreen section. All I take from that is that the driver uses the mouse coordinates in conjunction with application focus.

Hope this helps! And thanks for your interest in this problem.