HiHo Forum , I searched for a way to make a GUI DPI aware and found the excellent function _GetDPI() by Phillip123Adams. Now of course I'm lazy and wanted to write a respective wrapper for GUICtrlSetFont() and GUISetFont(). But how to obtain the handle of the "current" window? I just tried GUISwitch(0) in the function _GUISetFont_Ex() and it seems to work . Is this call okay, or are there any constraints I have to take into account? #include <GUIConstantsEx.au3> #include <Wind