The Log Message action lets you send a message to the log file and the log window (if Print Distributor Manager is running).
The message is a template so you can include information about the print document such as the users name or document name, the default value for the *Message * property is:
New Print: ?? DocumentName ?? from: ?? Username ??.There is an Error property that will highlight the message in the log.
If you want to look at the complete log file you can find it using the Tools->Open Config Folder menu in Print Distributor.