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Is it not possible two screens to display with the resolution of both.
I do not mean to double the Window like here ...

you could try as you suggested, expanding the width of the DB Window, but if you mean can you have 2 seperate windows then no, Darkbasic will only allow you to have the 1 output window.

If you have something like BlueGui, Then you may be able to get around this by applying a camera to an image, and texturing a panel with that image in a separate BlueGui Window, but that would probably give you a very slow FPS, But that way you would have 2 graphical windows which is what i think you mean.

Edit: You could also set the DBWindow to double width, then create a second camera, you resize the origional camera, (Cam Num \ View Port 0) to the left side, and resize Cam Num 2 to the Right Side, that would work giving you 2 different camera views on separate monitors, This would also give a better FPS than the BlueGui Idea, and be easier to do.

I dont want two Windows beside. If i had 2 Screens with a
resolution wide 1280 on both. Now i want use this with a display
wide of 2560 ...

But with "set display mode" i can set the wide of 1280 and
expand the window to 2560. This is not that what i want.

@Jukuma

I am new to DarkBasicPro from today and reading up on the forum what can and cant be done when I spotted your message about dual screen support.

From what I have read so far today this could be possible using DLLS, if object handles can be found in DBP.

For example if you can find the handle of a DBP window or indeed any object that has a windows handle, you should be able to move it to the other monitor using a standard windows api.