Windowed or Full Screen?

I like having the option to do it both ways.

Sorry, had to.
Anyways, windowed mode lags me like a giant peach. Full screen is the only way I can go.

You'd like that, wouldn't you?

I've also noticed some lag sometimes with windowed mode - that, or I manage to click outside the box accidentally and have to click back in.

The main disadvantage to windowed, as I just discovered this week while my parents were visiting, is that my mother can NOT keep away from that little red X. We went through several iterations of the following:

Her: "Can I check my email on your computer?"
Me: "Sure. It's on, just leave everything else like it is when you get off."
<She gets on, *closes* MS>
Me: AAAARGH!

So much for my FM spot, right?

They really, really, need to implement an "Are you sure you want to exit MapleStory? [Yes] [No]" box when someone clicks the red X.