by Darius Kazemi, Jan 23 2019
RFC-23 is dated October 16, 1969 and authored by George Gregg of UCSB.
This RFC cautions that a HOST must have code in place to process multiple control messages at once. The idea being that when the control link is awaiting its RFNM (ready for next message) signal from the IMP, other control messages could be accumulating. As such, we can't assume one control message at a time being sent to a HOST. We need to have code that processes control messages until there are no more left to process.