The problem was wrongly described by me. The actual problem is suppose in web page there is frame containing two html pages say htmA.html and htmB.html. In htmA.html there is one applet say AppletA and in htmB.html there are two applets say AppletB and AppletC. Now invoking the method of AppletA is not possible through AppletB but any method method of AppletC can be invoked through AppletB.
Is the AppletContext is limited to single html web page or for whole web page? If the appletcontext is limited to html page then what is the solution to invoke applet's method of other html page in same web page.