How it works
The logging system uses the Windows Event viewer for logging transactions that occur during execution. These messages are unique to each type of connection and transformation definition. Transformation messages & errors that may during message processing are normally specific to our application. Connection related messages & errors are more specific to the underlying framework. In other words, FTP connections may reveal FTP type messages and errors while SQL connections may record messages and errors that are specific to SQL Server and SQL transaction type behavior.
Using Windows Event Viewer
To use Windows Event Viewer you can go to Start-Run and type eventvwr.msc or you can follow the directions provided by Microsoft located here.