How to create thread in applet without causing modifyThreadGroup exception?

Question

I've searched through this forum, and it has dozens of posts regarding infamous modifyThreadGroup exception. The two answers I continuously stumble upon are:
1) Change something in permission file. This is unacceptable, because I'm writing an applet, which by definition should be portable.
2) Sign the jar file. This is still unacceptable, because a) I do not know how to do this yet b) from what I've seen, process of signing is quite complicated c) I'm still in the development stage, using NetBeans 4.0, so I can't use jar's d) I just need to instantiate a freakin' thread, that's all.
Now, instead of searching for quick fix, I want to ask couple of meaningful questions.
1) Why some security managers do not allow me to instantiate new threads in applet? Why other security managers do? (Write once, run everywhere. Yeah, right.)
2)How can I create thread in applet, maintaining applet's portability?
PS: Sorry for the attitude. The case is, such things in Java irritate me greatly.

Answer 1

what are you trying to do within these ThreadsMy applet needs to dynamically receive and display data from a server (also written in Java). Data changes over time, so applet needs to render this changes.
The problem is not with the content of the thread (for there is no content yet), but with the fact that tread created at all. Here is the code that generate named exception:
        Thread receivingThread = new Thread() {
            public void run(){
                //do something
[quote]
As you can see, I'm not even running a thread, but merely creating it. (Well, I will need to run it anyway, but it's the instantiation that causes problem currently.)