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1. cd in $(MOZILLA_FIVE_HOME)/java/xpcom/urp/src; run 'gmake' 2. for server running : cd $(MOZILLA_FIVE_HOME)/dist/bin; run 'server socket,host=YourHost,port=YourPort' 6. for client running: cd $(MOZILLA_FIVE_HOME)/dist/bin; run 'client socket,host=YourHost,port=YourPort'