Tracing is controlled by editing the web.config file for the site. To cause debug tracing to be written to the file c:\temp\debug.txt, the <trace> section must be updated: <trace autoflush="true"> <listeners> <add initializeData="c:\temp\wi-debug.txt" /> </listeners> </trace> To turn on tracing for a particular category, the <switches> section must be edited: <switches> <add value="1" /> <addFONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt; mso-ansi-language: EN-US" lang=EN-US> Logging" value="1" /> <addFONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt; mso-ansi-language: EN-US" lang=EN-US> EUEM" value="1" /> </switches> A value of switches 1 = tracing on, a value switches 0 =  tracing off.