In the system program sys.help.set, the Init PCL calls sys.get_msgline2()
in order to display the current value before allowing the user to
change it.
The entire Init PCL follows:
helpmsg = sys.get_help();
fkhelp = sys.get_fkhelp();
msgl1 = sys.get_msgline1();
msgl2 = sys.get_msgline2();
retsel = sys.get_return();