JAMS translates a Job's exit code into text from a system error code value. For example, an exit code of 0 corresponds with the message "The operation completed successfully".

A list of Windows system exit codes can be found here:

http://msdn.microsoft.com/en-us/library/ms681381.aspx

With a corresponding list of exit codes in Linux found here:

http://tldp.org/LDP/abs/html/exitcodes.html 

The translated exit code is displayed by JAMS in the Monitor view as well as in a Job's detail window: