The system program sys.mem.summary uses sys.get_program()
to re exec itself.
The advantage of doing this is that sys.mem.summary could be renamed,
and it would still work.
The code that does this is in the EndFldLp PCL getans().
Here it is:
if (sys.get_answer("Again?",'y',1,INP_QUICK) == 'y')
sys.exec_prog(sys.get_program());