Size of game window

[One Tin Soldier]

Ok I'm sure this is a stupid question but as always I'm clueless with computer stuff. I don't even know if it's correct to call it the "game window".

Alright, when I start up the game the (for lack of a better term) game window doesn't fill my monitor. Well ok I assume part of the reason for this is because I have a widescreen monitor and those didn't exist back in the day. But it doesn't even reach to the top and bottom of the screen.

This hasn't been a big problem for me but just recently a friend of mine got set up and started a new character and his monitor is bigger than mine and the..uh..game window on his monitor only takes up about half the space on his screen. So, naturally, he would like to enlarge it.

The thing is he's even more clueless about this stuff than I am (if you can believe that). So after trying some searches here and not finding anything that helps I thought I'd just go ahead and ask if anyone can tell me how to enlarge the game window (or whatever the heck it's supposed to be called).

I tried changing the resolution in the game options and that doesn't seem to have any effect at all.