5. Description of the Option The data sender and the data receiver use the 8-bit value(s) along with the DS and DR SB commands as follows (multiple 8-bit values are allowed only if each is greater than zero and less than 251):
8-bit value Meaning
0 Command sender suggests that he alone will handle
the vertical tabstops, for the connection.
1 to 250 Command sender suggests that the other party alone
should handle the stops, but suggests that the indicated value(s) be used. Each value is the line number, relative to the top of the printer page or terminal screen, that is to be set as a vertical tabstop.
251 to 254 Not allowed, in order to be compatible with
related Telnet options.
255 Command sender suggests that the other party alone
should handle output vertical tabstops and
suggests nothing about how it should be done.
The guiding rules are that:
1) if neither data receiver nor data sender wants to handle output vertical tabstops, the data receiver must do it, and 2) if both data receiver and data sender want to handle output vertical tabstops, the data sender gets to do it.
The reasoning for the former rule is that if neither wants to do it, then the default in the NAOVTS option dominates. If both want to do it, the sender, who is presumed to have special knowledge about the data, should be allowed to do it, taking into account any suggestions the receiver may make. This is necessary due to the assynchrony of network transmissions. As with all option negotiations, neither party should suggest a state already in effect except to refuse to negotiate; changes should be acknowledged; and once refused, an option should not be resuggested until "something changes" (e.g., another process starts). At any time, either party can disable further negotiation by giving the appropriate WON'T NAOVTS or DON'T NAOVTS command.
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