This library includes many useful routines: ReadParse which gets all form parameters and writes them into a field variable, PrintHeader which prints the Content-type text/html, HtmlTop(title, background, kopf) that simply prints a head of a HTML document, HtmlBot(title) that prints the bottom of a HTML document, SplitParam that splits a list, CgiError which prints out error messages, Check_Name which checks if a username contains dangerous signs for filenames, Get_Seconds that returns the number of seconds, lock(filehandle) that implements a locking function, unlock(filehandle) that implements a unlocking function, and more.