Continue to run program after terminal is closed

If you are running some thing in your terminal, say compiling a kernel, which might take a long time. It is a little dangerous to use th normal terminal that you get from the "GUI" because even if you close the terminal by mistake all your work will be lost and you would have to start from the beginning again. 

So a work around is to use the GNU screens. 

GNU screen basically lets you run multiple terminals with in the terminals and also allows you to detach your terminal from the current terminal. But the process continues to run even after the terminal is detached, but the process can again be controlled once the terminal is reattached. 

The command that is used to achieve this is "screen". 

Will provide more details soon.