i think you all got me wrong!

i know what the system account does and what it is used for,
but when you start explorer as system, then you'll see in the start menu that you are system.
also it is possible with this account to access the sam strings and securitystrings in the registry that you can't access as a normal administrator .
but i didn't know you can change the system account password, how do you do that? just open explorer and press ctrl-alt-del for change password?

but what i thought was: maybe it is possible somehow to login using the normal loginscreen with the system account, since there is not a password set by default.
and for the helpassistant and support account, those are the first accounts i disable when i install windows xp or 2000.
but i was just curious how you can use the support account, cause when we can, someone else can too!!!