Yes, the applet cannot open a listener (ServerSocket) to listen to JMS.
No, as JMS jar is trusted, messages can be sent to an applet freely.
As JMS is server-side technology applet could not use JMS.
Yes, the applet can receive messages only from the server it came from itself.
No, as JMS requires a RMI connection to be installed.
Yes, the applet can connect only at the port 80.
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