5 - bridge series
4 - bridge split
3- bridge neck parallel
2- neck split
1 - neck series
5+PP out - bridge paralel
1+PP out - Neck parralel out of phase
Thats the switching on my main guitar. My other 2 HB guitars are Ibanez RG standard format (forget what that is now, but its got splits and paralels in there somewhere, I just use bridge and neck on that one) and normal 3 way.
Also notable - my HSS guitars are all wired so that pos 4 is the two singles in series (one is RPRW, so that makes a really unique humbucker sound, and one isnt, so that makes a HUGE single tone (especially as its with uber trilogies)