| os.lock | R Documentation | 
This locks Windows after set amount of time.
os.lock(s = 0, m = 0, h = 0)
| s | time to wait before shutting down (in seconds), added to m and h; passed to  | 
| m | time to wait before shutting down (in minutes), added to s and h; passed to  | 
| h | time to wait before shutting down (in hours), added to s and m; passed to  | 
The status code of shell.
Tal Galili
https://superuser.com/questions/42124/how-can-i-put-the-computer-to-sleep-from-command-prompt-run-menu , https://www.howtogeek.com/howto/windows-vista/quick-tip-create-shutdown-restart-lock-icons-in-windows-vista/
system,shell, Sys.sleep, 
is.windows, os.shutdown, os.sleep, os.hibernate, os.lock, os.restart
## Not run: 
## when your code is extremely time-consuming, 
# you may need this function to run at the
# end of the simulation.
os.lock()
## End(Not run)
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