# File lib/net/ssh/connection/driver.rb, line 169
        def global_request( type, data=nil, &block )
          writer = @buffers.writer
          writer.write_byte GLOBAL_REQUEST
          writer.write_string type.to_s
          writer.write_bool true
          writer.write data.to_s if data
          @session.send_message writer

          @request_queue.push Request.new( type, data, block )
          self
        end