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+Network Working Group                                     Jon Postel  (SRI-ARC)
+Request For Comments: 718                                              Jun 1976
+NIC #35874
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+The following memo was a page of a document describing changes in
+version 1.34 of the Tenex system. I believe that the author is Ray
+Tomlinson or someone else in the BBN-RCC Tenex group. In any case Ray
+has agreed that these comments should be circulated to the to the
+network community, rather than to only the Tenex community.
+
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+         Comments on RCTE from the TENEX Implementation Experience
+
+The code to implement the RCTE option of the new TELNET protocol for
+TENEX has been completed. The RCTE option permits a reduction in network
+traffic by deferring the transmission of characters which will not cause
+the receiving user program to be activated until a character which will
+cause the user program to be activated. A further reduction is achieved
+by minimizing the flow of echo characters back to the user TELNET
+program. This is done by having the server instruct the user TELNET to
+echo the group of characters up through the next wakeup character. By
+sending this command as the user program is about to read the first
+character of that group, the echo is guaranteed to follow any response
+to the preceding group of characters.
+
+Significant problems with the RCTE protocol were encountered. The
+handling of spontaneous output was specified in a way that made the
+implementation extremely difficult to do correctly (if, indeed, a
+correct implementation is possible). The solution here was to completely
+isolate the control of input transmission and echoing from the
+characters flowing in the output stream. Synchronization of input and
+output then occurs directly by virtue of the embedding of control
+information in the output stream. This approach permits a simplified
+coding of both the user TELNET and server TELNET.
+
+A second problem was the handling of interrupt characters. The RCTE
+protocol fails to provide an explicit mechanism for interrupt characters
+thus necessitating the handling of interrupt characters as program
+wakeup characters. Since the interrupt characters are not actually
+handled as program wakeup characters and, in fact, bypass the terminal
+input buffer, a special provision had to be made to get the command sent
+back to the user TELNET to indicate that the character stream should be
+echoed beyond the point where the interrupt character was typed. The
+transmission must be synchronized with the processing of the terminal
+input buffer so that it will be sent at the proper time. This was
+achieved by putting a marker in the input buffer at the point where the
+interrupt character was. This marker is never given to the user's
+program and must not be counted as an input character. A new counter was
+installed indicating the number of such markers in the input buffer and
+the SIBE JSYS modified to indicate "empty" only if the difference of the
+total characters in the buffer and the number of markers in the buffer
+is greater than 0.
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+                                   -1-
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+A third problem is handling the case where the input buffer is cleared.
+Since the buffer may contain various wakeup characters and special
+markers, when the buffer is cleared, the user TELNET and SERVER may get
+out of sync. It is infeasible to scan the buffer and send a RCTE
+command for each such wakeup character or special marker. instead, a
+command is sent to the user TELNET meaning "clear your input buffer and
+reset your counters". This command is implemented by sending "WILL
+RCTE". This is the reverse case from a normal RCTE (i.e. DO RCTE) and
+thus cannot be confused with the normal use of the RCTE option. This
+saves adding a new option.
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+                                   -2-