As far as I know only in the G4 iMacs (lamp style), and from those only in a few, you were able to enable screen spanning. On iBooks from the 800 MHz series up you were also able to do so. The G3 iMacs are mirror-only and that at 1024*768 only, so it won't work.
As far as I know only in the G4 iMacs (lamp style), and from those only in a few, you were able to enable screen spanning. On iBooks from the 800 MHz series up you were also able to do so. The G3 iMacs are mirror-only and that at 1024*768 only, so it won't work.
Screen Spanning Doctor enables extended desktops on PowerPC iMacs but not 15" models (be they iMac CRT Slot or iMac G4) (the exception being the 1GHz 15" G4). 15" iMacs are stuck with their native resolutions (i.e. XGA).
The only thing I can propose is to try SwitchResX. This allows custom resolutions on the Internal display and so may allow you to achieve a 1024x640 (or something) which, if the external display supports this res would be widescreen. You can't turn the Internal display off AFAIK.
Comments
As far as I know only in the G4 iMacs (lamp style), and from those only in a few, you were able to enable screen spanning. On iBooks from the 800 MHz series up you were also able to do so. The G3 iMacs are mirror-only and that at 1024*768 only, so it won't work.
Screen Spanning Doctor enables extended desktops on PowerPC iMacs but not 15" models (be they iMac CRT Slot or iMac G4) (the exception being the 1GHz 15" G4). 15" iMacs are stuck with their native resolutions (i.e. XGA).
The only thing I can propose is to try SwitchResX. This allows custom resolutions on the Internal display and so may allow you to achieve a 1024x640 (or something) which, if the external display supports this res would be widescreen. You can't turn the Internal display off AFAIK.