These are not desktop environments, as I said, they are window managers, that is, they provide the tools necessary for switching and controlling open windows. Desktop environments are window managers + extra tools like desktop shortcuts, common GUI utilities, applications, and some sort of a control interface for the system. But you do have small DE's like EDE
Anyway, after installing these, create a new user to test them out, create a file .xinitrc in the /home directory of the user, and place the following lines -
Code:
#!/bin/sh
exec icewm-session
Replace icewm-session with fvwm2 for fvwm. Read their manpages for more info. To get started with FVWM from scratch, read the second link I gave. For a jumpstart, check the third link, see a screenshot you like, and dowload the .fvwm2rc file along with any other icons or tools from the authors webpage, and follow the instructions present. If just a .fvwm2rc is provided, copy this to the .fvwm folder in the /home directory.