How to install Lubuntu Desktop Environment and ONLY the desktop environment?

view full story

http://askubuntu.com – I have a slower computer that I would like to use the Lubuntu desktop environment with. However, I do not want to install any of the software that is not related to the desktop environment. I am talking about programs like Abiword and Lubuntu Software Center. How do install the desktop environment and the desktop environment ONLY? Also, if someone could point me in the right direction for research, when I use multiple desktop environments, I notice that certain elements of one desktop environment (e.g. scrollbars, color schemes, program themes) are present no matter which desktop environment (HowTos)