Here is my ErrorLog.au3 UDF which I use every day. ErrorLog.au3 UDF is for log program activities and errors, to different output with possibility to switch output  function instantly. UDF: #include-once #AutoIt3Wrapper_Run_AU3Check=Y #AutoIt3Wrapper_Au3Check_Parameters=-d -w 1 -w 2 -w 3 -w 4 -w 5 -w 6 -w 7 #Tidy_Parameters=/sort_funcs /reel ; #AutoIt3Wrapper_Run_Debug_Mode=Y Global $__g_bUDF_ERRORLOG_FORCE_DEBUG = False Global $__g_sUDF_ERRORL