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The new functions for spark and openfire i require


I want to do teaching online.The teacher can charge for the teaching from the student.

The process as follows:the teacher does voice chat with the student using spark.There is one button named “Timer start” on the toolbar of the chat window.When the teacher clicks this button,the Timer begins to work,and the button becames to be “End Timer” and the student can also see the working Timer in his chat window.As soon as the teacher clicks the button “End Timer”,the Timer stops and the teaching ends and the student pays by the time the Timer counted.And only the teacher can charge