I'm not sure what you need exactly. If by "desktops" you mean
workspaces, then one of the reasons you'd use them is to separate
several workflows or groups of tasks. So it makes sense not to Alt+Tab
to windows on another workspace. What you may need is simply to use
Ctrl+Alt+Left/Right to switch to the next workspace without the mouse.
That's the most logical design for me.
Another option would be to use the new GNOME Shell[1], which lists
windows from all workspaces when using Alt+Tab, with a mere visual
separator. Since that's going to be the new default for GNOME in the
future, you won't have to stop using it!
Regards
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Alternately you can enable a Compiz plugin called Shift Switcher - you
can set it up as an alternate to alt-tab and it can include all
workspace windows. For example I have Super-tab setup as all
workspaces, and alt-tab as only the single workspace I'm working on.
If you need to enable you should search Synaptic for the Advanced Compiz
Configuration Utility, install it, and then use it to enable to plugin.
Kirk
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