Daemonize

a daemon (pronounced /ˈdeɪmən/ or /ˈdiːmən/)[1] is a computer program that runs in the background, rather than under the direct control of a user; they are usually initiated as background processes.
In a Unix environment, the parent process of a daemon is often (but not always) the init process (PID=1). Processes usually become daemons by forking a child process and then having their parent process immediately exit, thus causing init to adopt the child process.

Example of Daemonize
http://www.itp.uzh.ch/~dpotter/howto/daemonize