Note also - some laptops expect to be open when running, as there are cooling vents that need to be open - and if you set it to run at full power all the time, you'll want good cooling anyway.
So the best plan is probably to stand the laptop on its side edge, slightly ajar - for cooling and stability - and make sure any cooling vent on an edge is on the uppermost edge. This may interact with where the monitor plugs in - if so you'll just have to do the best you can.
Thanks, I've managed to connect it. The vga port is on the left. The laptop graphics card wasn't able to support the resolution of my 20" tft so the pixels looked very big, plus with it being vga and not dvi the picture quality is not as sharp.