Generalized checkPrivilege

foreach stackFrame{ // from new to old

if (class in stackFrame can’t access target by policy)

throw ForbiddenException;

if (stackFrame has privilege for target)

return; // allow

if (stackFrame has disabled privilege for target)

throw ForbiddenException;

}

// we are now off the end of the stack

if Netscape throw ForbiddenException

else return; // MSIE and Java 2 allow access

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