Sometimes these variables are called port, sometimes ipc, sometimes they have the name of the thread on the other end and sometimes not. My proposal is that we standardize on an obvious name for all of them:

• layout_sender ← Always sends to the layout thread
• layout_receiver ← Always receives from the layout thread
• script_sender ← Always sends to the script thread
• script_receiver ← Always receives from the script thread
• constellation_sender ← Always sends to the constellation
• constellation_receiver ← Always receives from the constellation thread
• etc