How to run in 2 monitors

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Boiled Sweets

This doesn't seem to work. I used...

screenWidth = GadgetWidth(Desktop()) 
screenHeight = GadgetHeight(Desktop()) 

screenDepth = GetDeviceCaps(hDC, BITSPIXEL)

If screenDepth < 16
   screenDepth = GetDeviceCaps(hDC, PLANES)
   If screenDepth < 16 Then Return
EndIf 

screenHertz = GetDeviceCaps(hDC, VREFRESH)
If screenHertz < 60 Then screenHertz = -1

Graphics screenWidth, screenHeight, screenDepth, screenHertz

Now the 2 people that were testing this on their multiple monitor setups now say NOTHING appears whereas before using this to get the desktop size it ran in at least one of the monitors

      screenWidth = GetDeviceCaps(hDC, HORZRES)
      screenHeight = GetDeviceCaps(hDC, VERTRES)

Does anyone know how to run BlitzMax to run in both monitors?