I had a little fight with FVWM and Dzen2 today. I tried to get Dzen to stay underneath my windows, and tried a couple of different settings, until i came up with something that works.
Dzen needs to be started with the
command line option.
That was the easy part.
Now we need to define some custom style rules in FVWM. Using the -dock option makes FVWM put a titlebar and borders on the dzen windows, and actually starts treating them like normal windows (as opposed to them being treated as dock windows when not using the -dock option :S )
So this code snippet removes those bars, makes them behave more like dock windows again, and fixes them on the bottom layer:
1 Style "dzen" NoTitle, NoHandles, BorderWidth 0 2 Style "dzen" WindowListSkip, Sticky, ClickToFocus 3 Style "dzen" Layer 0, StaysOnBottom