Hi Sonex All windows under the same key (e.g., TimeWindow(0, 3600) and TimeWindow(3600, 7200)) will be processed by the flatmap function. You can put the variable drawn from TimeWindow(0, 3600) into a State. When you receive TimeWindow(3600, 7200), you can access the state and apply the function with the obtained variable. Regards,Xiaogang ------------------------------------------------------------------发件人：Sonex <kls.yan...@gmail.com>发送时间：2017年2月20日(星期一) 19:54收件人：user <user@flink.apache.org>主 题：Re: 回复：Transfer information from one window to the next I don`t think you understood the question correctly. I do not care about information between windows at the same time (i.e., start of window = 0, end of window 3600). I want to pass a variable, let`s say for key 1, from the apply function of window 0-3600 to the apply function of window 3600-7200, for key 1.
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