The AppendToLog method adds a string to the end of the Web server log entry for the request. You can use it multiple times in one section of script. Each time the method is used, it appends the specified string to the existing entry.
To record the specified string in the log file, you must enable the URI Query option of the Extended Properties property sheet for the site whose activity you want to log. To access this property sheet, from IIS Manager, right-click the Web site, and select Properties. On the Web Site tab, verify that Enable Logging is selected, and then click Properties. Note the default settings on the Extended Properties property sheet.