Greetings,
This will be my first use of a multithreading application. I am attempting to create an application that will have a GUI for user input and configuration, communicate with a PLC via DDE or OPC communication, and communicate with a printer via serial communication.

For the PLC:
I will need to maintain a heartbeat (change a bit in the PLC every few seconds and wait up to 30 seconds to see it change back)....