it should be easy to write a serial mouse decoding external, and use it with the comport external.

Thanks for the insight. One question though (bear in mind that it may be naive, as I am a week old today in PD): If I were to write an MS serial mouse external, it would operate most efficiently like this?

[comport]---raw serial data--->[ExternalForSerMouse]---X pos | Y pos | Btn1 | Btn 2--->do stuff

Thanks, rs