IMHO locking should always be minimal. You should only lock the necessary objects. However you may want to take a look at the Poolman Package. It is a very powerful object/connection pooling approach ( http://www.codestudio.com/ ) - not really what you wanna do here but closely related.
You can connect to basically any port on the server from which the applet was loaded. This includes ftp as well as smtp or other ports. There is a convenient ftp package available through www.jars.com. I do not remember the exact name, just search for ftp there.
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