>>When I set the screen background it requires a number if I use, for example:
>>
>>_SCREEN.backcolor=9454143 I get a dark blue screen,
>>
>>but where can I find how these numbers corespond to the numbers like on a Form if I use Backcolor 0,64,128 which is roughly the same color.
>
>Take a look at the RGB() function.

I think he want to extract R,G,B values from a specified number

This can be done using algorithm below

RGBColor = _Screen.BackColor 
Red = RGBColor % 256 
Green = FLOOR( RGBColor % 256^2 / 256)
Blue = FLOOR( RGBColor / 256^2)