🚀 go-pugleaf

i have a swingbased applet with a menuitem Exit. From netscape or ie
when i click this menuitem it throws up an error with the following
stack:

Exception occurred during event dispatching:
sun.applet.AppletSecurityException: checkexit
 at sun.applet.AppletSecurity.checkExit(AppletSecurity.java:239)
 at java.lang.Runtime.exit(Runtime.java:83)
 at java.lang.System.exit(System.java:488)
.....

my code in exit event is:
    System.exit(0);

this works well appletviewer.

my applet is not signed. may be is it because of this ? is there any
other way to exit (or close) an applet ? (the question itself maynot be
sensible since, where can the applet exit TO, from a browser?!) but i
would like to know the standard practice of quitting an applet from
browser.

Thanks
Vasu