Al, thanks for the advice, but I just don’t get it. I thought I would need an input to sink the current and pull the line low. How would an out put on the Tris sink current? I’m sure it has to do with the port Tristate hardware but it has been too many years since I could follow the data flow in that hardware. From what you’ve said it would look like this?

Code:
Toggle line w/pullup          
PIC1                        5VDC                  PIC2
TrisC.1=1…………………………..……………………!……………………………………………………TrisC.1=1
PortC.1=1                                         PortC.1=1


PIC1 -             PIC1 pulls line low             PIC2
TrisC.1=0….	                                 TrisC.1=1
PortC.1=0 !……………………………………………………………………………………………………PortC.1=1


PIC1 -               PIC2 test line                PIC2
TrisC.1=0                                        TrisC.1=1
PortC.1=0…………………………………………………………………………………………………………PortC.1=0
                                            IF PortC.1=0 THEN Whatever
Thanks,
Wayne