The HELP command can be called from the command line or by pressing the 
or 
key in INPUT, MENU, and REPORT mode. The HELP command branches to the HELP
mode and provides a list of commands that are currently available.
Positioning the cursor on the corresponding command and pressing the 
key branches from this list level to another one.
HELP information can be invoked directly by entering HELP together with a command in the command line:
==> help store