macro spell ranking

OK quick but noob question.. So does wow use the highest rank if you do not specify one for macros? For example for my chain heal macro i have

toon1
/stopcast
/target toon2
/cast chain heal

toon2
/stopcast
/target toon3
/cast chain heals

and so on till toon 5 whom targets toon1. My question is do i have to manually adjust the ranking in each macro on each account to the next ranking up or does wow use the highest one?

Yes it uses the highest rank unless you specificy it otherwise like

/cast chain heal (rank 4)

ok thats great i didnt want to throw in (rank#) every time i got a new one for each macro cheers