…The Associated Press confirmed through nationwide tests…
…uploads of complete files are blocked or delayed by the company, as indicated by AP tests.
Each PC gets a message invisible to the user that looks like it comes from the other computer, telling it to stop communicating. But neither message originated from the other computer — it comes from Comcast. If it were a telephone conversation, it would be like the operator breaking into the conversation, telling each talker in the voice of the other: “Sorry, I have to hang up. Good bye.”