meaning of config options

Hello list,

sorry for the number of questions today!
Can you explain to me the meaning for these config options:
loginTimeout, expireTime, idleTime, allowDublicateHandles

and one other thing, in Auth_Common::login, this properties are set:
loggedIn, currentLogin
are they only used in Auth_Common, or are the accessed diectly from
LiveUser or somewhere else, in other words, do I have to care about
these properties? It seems that Liveuser uses $auth->loggedIn, any
others to worry about?

Mahlzeit ;)
Georg