Why can't I run Allegiance in windowed mode?
From FreeAllegiance Wiki
By default, Allegiance is configured to run in full-screen mode when launched. To change this setting, use ASGS's Allegiance menu to choose "Windowed" mode.
- Launch ACSS, and do no sign in
- Click the 'Preferences' menu
- Check the 'Launch in Window' option
- Start Allegiance by clicking the 'Play online' button