both... the modules have to provide a hook in the form of a bang, like !labellsboxhook. then, in your .box files that define individual boxes, you have a line *modulehook !labellsboxhook, which hooks the module into the lsbox. also, you can put *wharfmodule $modulesdir$module.dll to put a wharf module in the box... this stuff is all lsbox specific, there arent any other modules that allow this as far as i know (skinbox maybe?)