The as400 List Job (QUSLJOB) API generates a list of all or some jobs on the system. The generated list replaces any existing list in the user space.
example:
The QUSLJOB API produces a list similar to the list produced by the Work with User Job (WRKUSRJOB) command
Using the QUSLJOB API to look for any jobs on *MSGW and take an action, in this case sending an email
http://www.code400.com/forum/showthread.php?t=1123