And now I wanted to do the same for Tables with PuP Videos (I know it is not meant to be used this way?). But when I try the same with for example GOTG:
1920
1080
1280
1024
1
1920
0
0
0
0
0
0
1920
0
1280
620
C:\Background\SpikeGrill.png
No matter what I do, the Backglass is put on top, even when I tell it to not to:
<gotg>
<HideGrill>1</HideGrill>
<HideB2SDMD>0</HideB2SDMD>
<HideDMD>2</HideDMD>
<LampsSkipFrames>1</LampsSkipFrames>
<SolenoidsSkipFrames>3</SolenoidsSkipFrames>
<GIStringsSkipFrames>3</GIStringsSkipFrames>
<LEDsSkipFrames>0</LEDsSkipFrames>
<UsedLEDType>0</UsedLEDType>
<IsGlowBulbOn>1</IsGlowBulbOn>
<GlowIndex>-1</GlowIndex>
<StartAsEXE>1</StartAsEXE>
<StartBackground>1</StartBackground> <--- "Small" turned on
<FormToFront>0</FormToFront> <--- "Bring BG Form to Top" turned off
<Animations />
</gotg>
If I kill the B2S Process, I can see the pup underneath. Is is maybe because of the "Small" button feature (StartBackground)?
Any ideas appreciated
I managed to compile the B2S Backglass Server myself, and the binary still worked well. 
Thanks @toxie for moral support: (translated by me):
in the end you only need Visual Studio (2022 should work, 2019 and before are tested) and that's it
It actually was that easy,
1. download VS 2019 Community edition (**** Update I can confirm that VS 2022 works as well, but it wants to upgrade the project files to use .NET 4.8 instead of 4.0 ***)
2. open the solution files
3. and then build it.
I have been a developer since early 90's, but first time with these things 
So end of long story. I managed to update the B2S Server so that when it is using the "small" button feature (adding a picture to the background):
Now you will still see any PuP Videos you have running, mixed with the B2S Backglass as well as the background picture. I like the outcome:
I hope you like it as well. I think it is not only of interest for 2 screen setup's? I will work with toxie on how we should merge my code if there is interest.
Edited by jarr3, 13 March 2022 - 04:38 PM.