Switching between windows

Hello,

I am writing a guide for a video game.
I would like to switch between my video game's window and my text editor's
window a lot of times.
The problem is : Alt+Tab shortcut doesn't work when the video game is running.

I found a solution : open two X sessions. The first session run the game. The
second session run the text editor. Then I can switch using Ctrl+Alt+F7 and
Ctrl+Alt+F8.

This is how I do :
$ startx &
$ startx -- :1 &

The problem is when I go the the first session using Ctrl+Alt+F7, my keyboard
doesn't work on fluxbox, my mouse cursor move but when I click on the desktop
nothing happened.

Can you help me to switch between windows on fluxbox?

Thank you.

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