I wanted my old laptop to boot into opera but have conky sit on top so I could monitor battery life, cpu usage etc. So I start opera automatically on boot by adding it to my ~/.xsession just before the last line and edited my ~/.jwmrc by adding these lines to the bottom of the file just before the close /JWM:
<Group>
<Class>Opera</Class>
<Option>layer:Bottom</Option>
</Group>
At first I tried making conky the top layer but every time I did that jwm freaked out and basically crashed. so making opera the bottom most layer works almost as well.
two other conky things I did was to use ~/.jwmrc to tell it to hide the conky titlebar:
<Group>
<Class>Conky</Class>
<Option>notitle</Option>
</Group>
and in ~/.conkyrc, tell to use a transparent background
own_window_transparent yes
I welcome any suggestions for improvements