irsssi multi server usage

[Admin]

Hi there,

I am not completely understanding about Irssi and I've read the 
instructions.  I have three separate servers and six channels total that 
I am a member of.

I know that control-X is a way to switch between the servers.  but how 
do I arrive at the channels to see what is posted to them.

does the command "/SET autolog ON"  log all the channels?

How do I know which channels have messages posted to them?

is there a god howto that explains these questions and related 
multi-server usage in better detail?

Cheers,

Noah