Redirecting to Craft OS

I made this password program that when it gets the correct password, it does nothing. I want to make it open up TO Craft OS, and not another OS i have to put the code in
I dont know how to do that, i looked everywhere and cant find the answer, so if there is a simple line to open up Craft OS after the password, can you please tell me so i may finish my program? Of course, when it opens up to Craft OS, it cant go back to the password thing unless it does os.shutdown or reboot.

Split into new topic.

If you have a while true do loop, and you want to launch CraftOS INSIDE that loop, try

shell.run("shell")

When the user types "exit", it will return to your program.

Indeed, and if you want to return to the top shell, you can simply do:

error()

You won't be able to return back to your program then.