Specifies that the data should be sent whenever it is set.
Specifies that the data should be sent once only. Note that this is not an efficient way of receiving data frequently, use one of the other periods if there is a regular frequency to the data request.
Specifies that the data should be sent once every second.
Specifies that the data should be sent every visual (rendered) frame.
Specifies that the data is not to be sent.