me thinks it was Redshift, but it's pretty simple. Lower the resolution of your DoD in-game before you do it (i.e. if you have you res at 1024x768, lower it to 800x600), then you should see "Run thsi game in a window" (or words to that effect). Tick that box then restart DoD and voila!
BTW to get in there click on "Options" then click on "Video"