Hallo,
I’m writing a little application that has to change the screen appearance font size (normal large and extra large) at run-time.
I have already read several posts about how to get the DPI setting back or change it. The problem is how to propagate this change to the system.

Sending a WM_SETTINGCHANGE message with SETNONCLIENTMETRICS
WPARAM affects only the Desktop Icons. The taskbar and start menu are not affected.

Code:
SendMessageTimeout HWND_BROADCAST, _
   WM_SETTINGCHANGE, _
   SPI_SETNONCLIENTMETRICS, _
   0&, _
   SMTO_ABORTIFHUNG, _
   10000&,
   dw_Result

Thanks a lot for helping


James