Angelusdomini

Hello, I have a e6420 running 10.7.5 I was able to get most of system working after a little play using MyHack. I would like to use this system for work and I have a docking station. I would also like to use two external monitors. I haven't found a why to disable the built in LCD and put the unit in to a clamshell mode. I am searching the web and trying to find an idea as to how to do this. Any suggestions would be appreciative. Thank you, John