ok, I get you now. The answer is no. Your iMac uses a Rage 128 graphics card from ATI that can not support dual monitors in any way. It simply isn't capable. However, many models do support dual monitors with a fairly simple hack. This includes all Radeon based eMacs and iBooks as well as all new models of the G5 iMac.
Sorry I forgot to mention this, if all you want to do is MIRROR your screen, then of course you can do that without any sort of additional software. This hack is for extending your desktop across two screens.
Xplain's use of MacNews, AppleCentral and AppleExpo are not affiliated with Apple, Inc. MacTech is a registered trademark of Xplain Corporation. AppleCentral, MacNews, Xplain, "The journal of Apple technology", Apple Expo, Explain It, MacDev, MacDev-1, THINK Reference, NetProfessional, MacTech Central, MacTech Domains, MacForge, and the MacTutorMan are trademarks or service marks of Xplain Corp. Sprocket is a registered trademark of eSprocket Corp. Other trademarks and copyrights appearing in this printing or software remain the property of their respective holders.
All contents are Copyright 1984-2010 by Xplain Corporation. All rights reserved. Theme designed by Icreon.