Also try to set the PPT to output on COM3 or COM4.
The newer versions of the PPT computer often times output on
either COM3 or COM4.
As Farshizzo mentioned, if the TALK button does not stay down, then most likely you are trying to output on a COM-PORT that is invalid.
Just to make sure, you have your PPT computer connected over a Serial Nullmodem Cable with the rendering computer, i.e. you are trying to stream PPT data over serial?
I'm just asking this because of your mentioning of VRPN initially.
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