An external FastCGI program (it usually is a process) is started once by web server program or by some other program / process and then it waits for a network connection which is established permanently by web server; through that connection are sent the request parameters and read data responses. https://leistungsberichte35429.thechapblog.com/27777007/5-einfache-fragen-Über-kampagnenanalyse-beschrieben