To use this module, add the following import to ~/.xmonad/xmonad.hs:

 import XMonad.Hooks.ManageDocks

The first component is a ManageHook which recognizes these windows. To enable it:

 manageHook = ... <+> manageDocks

The second component is a layout modifier that prevents windows from overlapping these dock windows. It is intended to replace xmonad's so-called gap support. First, you must add it to your list of layouts:

 layoutHook = avoidStruts (tall ||| mirror tall ||| ...)
                   where  tall = Tall 1 (3/100) (1/2)

AvoidStruts also supports toggling the dock gap, add a keybinding similar to:

 ,((modMask x, xK_b     ), sendMessage ToggleStruts)

Important note: if you are switching from manual gaps (defaultGaps in your config) to avoidStruts (recommended, since manual gaps will probably be phased out soon), be sure to switch off all your gaps (with mod-b) before reloading your config with avoidStruts! Toggling struts with a ToggleStruts message will not work unless your gaps are set to zero.

For detailed instructions on editing your key bindings, see XMonad.Doc.Extending#Editing_key_bindings.