First I tried the separate X screen option, but later on found the Twinview much more useable. This way the two monitors look like one large monitor, one attached to the other from any direction, or can be just a cloned screen.
Windows users - programmers and graphicians - say two monitors are absolutely needed for the work. But under Linux, due to the much more advanced window handling and multiple desktops in both Gnome and KDE, I did not find it very useful. After a month I can say it is good for keep widgets, to show logs or graphs, and keep the chat window - with setting to show on all desktops (always on visible workspace) - to keep always in touch.
And the problems. I don't know why, sometimes applications start on the second monitor. I did not find any logic in it yet, but maybe it exists. Full screen applications, games open in both monitors, just like it would be one large - so half here, half there. If the application uses another resolution than the main screen, it can be set to show just on one monitor this way:
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
Option "TwinView" "1"
Option "TwinViewXineramaInfoOrder" "CRT-0"
#REMOVED Option "metamodes" "CRT-0: 1680x1050 +0+0, CRT-1: 1360x768_60 +0+1050"
Option "metamodes" "1680x1050,1360x768_60 +0+1050; 1024x768,NULL;"
SubSection "Display"
Depth 24
EndSubSection
EndSection
Look at the metamodes option, we leave the first settings as the normal resolution of the two screeens. Then we add a second resolution (1024x768,NULL;), which means when an application switches to 1024x768 24bit, it will be shown on the first monitor only, the second will be disabled. This can be done with any resolutions, both 16 or 24 depths.
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