Forums Scripts & Popups channel key

Hey, i want to store the current channel key for say #test, to $chankey how would i do this so when the channel key was changed it would update? if this is possible

$chan($active).key returns the current channel key for the active window.

ok that would work however is there a way to specify chan just incase its not the active window

$chan(#chan).key

Or for that matter, $chan(N).key
e.g. $chan(1).key