I'm not acquainted with it yet,cause i havent installed it.Will do it by today night & get back to you.
But other than that there is simply no chance of getting updates to all the clients available.
Oh btw you man try the GFI Languard Scanner,if i'm not wrong then it does a fair enough job of scanning & updating computers through windows update.
Though this may not be what you want in the first place.
My suggestion would to read up a bit & get WSUS working.