I've managed to set up nVidia TwinView on my laptop (1280x800) display with an old Belinea (1024x768) display. At the moment, however, the monitor is where the kdm login screen, kicker and everything else goes but I would like it to be on the laptop lcd display. I've included the section from my xorg.conf that deals with twinview. Can anyone help?

Section "Screen"
DefaultDepth 24
Device "Device[0]"
Identifier "Screen[0]"
Monitor "Monitor[0]"
Option "CoolBits" "1"
Option "TwinView" "True"
Option "TwinViewOrientation" "RightOf"
Option "UseEdidFreqs" "True"
Option "MetaModes" "1024x768, 1280x800"
Option "SecondMonitorHorizSync" "30.0 - 65.0"
Option "SecondMonitorVertRefresh" "50.0 - 120.0"
SubSection "Display"
Depth 24
Modes "1280x800" "1280x960" "1152x864" "1024x768" "800x600" "640x480"
EndSubSection
EndSection

From what I understand, you can see everything fine on your CRT monitor, but there is nothing on the LCD screen on your laptop. If that's true, try this: Find the function (fn) key on the laptop. Also, one of your F keys (usually F7 or F8) should have a picture of a monitor or the words CRT/LCD. Hold down the function key and press the 'F' key that has either the picture of the monitor(s) or CRT/LCD. You may have to do this a couple times to get a picture on both screens. Let me know if this helps.

What I'm trying to achieve is a dual display where my CRT is one half of the desktop and the laptop is the other half. This is called Xinerama in xwindows and TwinView if you have an nVidia card.

Xinerama in xwindows wouldn't set the resolutions differently on each desktop, so I gave up on that. I found out about TwinView and since I have an nVidia card, tried to set that up. I managed to get it to separate the screens correctly however the first display defaults to CRT. This is because CRT is scanned before DFP (digital flat panel) connections, so CRT is found first and set as primary. Sadly, this is not a bug in the driver but expected behaviour, according to nVidia. All of the details are on this rather lengthy post: http://www.nvnews.net/vbulletin/showthread.php?t=54638. nVidia do claim that they will implement a feature to change the first display device, but are giving no indication as to when.