KJOB is the command to use when you wish to leave the system.
Please remember to KJOB when you leave since each job, even
if it is inactive uses system resources, such as core storage
in the monitor's data area and space on the swapping disk.
You may simply type the letter K followed by carriage return.
This command runs the LOGOUT program, which will delete your
RPG files, and if there are no files in your disk area, it will
delete your file directory.

For information about various LOGOUT options, read the file
LOGOUT.BH[UP,DOC].