Is there any existing documentation on the WAM namelists?

I need to know how to turn it on to write output?

I couldn't find any information on the parameters in the namelist (there are two namelists, wam_namelist and wam_namelist_coupled_000, what is their difference?) and I would need significant wave height (SWH), mean wave direction (MWD) and mean wave period (MWP).