Autoit work on only one window

Hello, anyone knows how I could make a script that runs in a single window defined? For example I want it to work on perfect world, and I want to make MSN the same time ..

Thx

MSN and PW in the same window? oO

lol no, hum, I want my script to work in a defined window, even though I'm not above it must continuously run the script on the window that I defined. ^ ^

charname = blub
$list = WinList("[CLASS:ElementClient Window]")
for i = 1 to list
If memread(charname) = charname then bla
next

Thanks, i'll test it :p