Borderless windows
From Fluxbox-wiki
How to make windows borderless.
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Add the following entry to your ~/.fluxbox/keys file:
Mod4 t :ToggleDecor
Use the one above or choose another key combination (windows-key + t in this case).
You now have to reload the configuration with
fluxbox menu -> reload config
After the reload your key combo is ready to work and you can toggle the window decoration on and off.
Per application (global)
If you want a specific application to be always borderless, then right click the window title to bring up the windowmenu. Go to the 'Remember' section and enable 'Save on close' and 'Decorations' Options.
Now use your keybinding to remove the window decorations. Closing the window will save the settings to your ~/.fluxbox/apps file. All aterms you open from now on will have no window decorations.
Per application (specific)
The previous way will be a global setting for one application. If you want for example your aterm with irssi running in it to be the borderless window BUT all other instances of the aterm show the window decoration normally, you need to set a name for this specific aterm. Most terminals use the "-name" switch for it:
$ aterm -name irssiterm -e irssi
Applying the key-combination on that special aterm will create an entry in your apps file similar to this here:
[app] (name=irssiterm) (class=Aterm)
[Deco] {NONE}
[end]
and it will ONLY apply for an app named "irssiterm" which you can force via the -name switch.
Global
You can also have all windows borderless by default, set
session.screen0.defaultDeco: NONE
in the ~/.fluxbox/init file and reload the configuration.