Pass Hostname to a batch script

From a triggered alert, I'm running a batch script and trying to pass the host name using this parameter %event_1.HostName% as the variable.  This worked fine using Intrust version 11.1 but, it doesn't seem to work for version 11.4.1.  Is there a different variable that I can use for hostname?  The application that is running the batch file is using %1 within the script and is not seeing the parameter that is being passed.