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A comment on Show HN: A virtual whiteboard for working or teaching remotely. Parent comment

Re:Show HN: A virtual whiteboard for working or teaching rem... by Omnipresent on Thursday August 21, 2014 @12:21PM (#8208123)
This looks awesome!! Using servlets how did you make it so that the changes on the whiteboard take effect on all browser windows? or is that something GWT does?
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Re:Show HN: A virtual whiteboard for working or teaching rem... by DCKing on Thursday August 21, 2014 @01:02PM (#8208352)
I don't know what he's using, but Servlet 3.0 and its implementations have support for WebSockets which would work fine for something like this.
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