Table 9. Using several display devices
| Primary | Limits | Secondary | Limits |
| CRTC | CRTC | ||
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| LCD |
| CRT | C, O |
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| LCD |
| TV | C, O |
Two Displays | CRT |
| TV | C, O |
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| LCD + CRT | R |
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| CRT + TV | R |
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Three Displays | LCD + CRT | R | TV | C, O |
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C = Coprocessor mode only
E = No Expansion
O = No Overlay
R = Same Refresh rate
The same CRT controller can not be used for both LCD and TV.
Basically, the program should be started in the primary monitor, then you can drag the program to the secondary monitor to use. But, some programs are not able to drag from the primary monitor to secondary monitor.
The order of Icons on the Windows desktop could be changed after using Duo View mode.
Limits on Video Driver while using Duo View mode
1.Certain combinations of display modes, color depth and refresh rate, when Duo View mode is active, are not supported because of video memory bandwidth limitation.
2.When using Duo View in simultaneous display mode, frame rates in Direct Draw applications are slightly lower because of the need to synchronize buffer flip.
3.If the primary/secondary monitor on Duo View mode is set to high resolution and high refresh rate display mode, the full frame rate setting on
4.It is not possible to use 16 bit colors in Windows 98. If so, secondary monitor on Duo View mode can not support the VGA mode.
96 Using Duo View mode