Writing applet datas to a file

Hi...can anyone say me,whether it is possible to write datas from an applet to a file..Like,getting the change in x & y co-ordinates and writing it to a specified location..i.e.,in a temp file

Applets can use the same file I/O classes and methods regular Java applications can use, IF they are digitally signed. That's a security restriction of the applet sandbox. See http://faq.javaranch.com/java/HowCanAnAppletReadFilesOnTheLocalFileSystem for more information about this.