What is a Daemon?
In Unix and other computer multitasking operating systems, a daemon 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. Typically daemons have names that end with the letter "d": for example, syslogd, the daemon that handles the system log, or sshd, which handles incoming SSH connections.
In the Microsoft DOS environment, such programs were written as Terminate and Stay Resident (TSR) software. On Microsoft Windows systems, programs called services perform the functions of daemons. They run as processes, usually do not interact with the monitor, keyboard, and mouse, and may be launched by the operating system at boot time. With Windows NT and later versions, one can configure and manually start and stop Windows services using the Control Panel -> Services applet.
Daemons in PHP
There is a PHP class created by Kevin van Zonneveld that is very helpfull, you can download from here. I think everyone have to take a look. For more information go here: Create Daemons in PHP.
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