WDM newbie needs some guidance!

Hi, 

I've just installed WDM 5.5.1 and it seems to be working fine - it autodiscovered our Dell Wyse D50Q devices correctly. What i'm struggling to understand is how the image/agent/addon updates work. I've been able to push out the 11.3.106.01 SUSE Linux image OK, but how can I push out the addons? Also is there a way to update BIOS from WDM?

Any help gratefully received!