Bit Shift (bitshift)'s status on Monday, 01-Oct-12 03:54:57 UTC
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@nlghtmaremoon From some research the same subject prompted me to do: it's called a carrier signal flag, and it's meant to be flipped up both by you when you want to send something, and by the postal carrier when you've received something. I have no idea if it's actually still used like that, though, since I don't even live in the US.