On the following pages are descriptions of each command recognized by the NNTP server and the responses which will be returned by those commands.
Each command is shown in upper case for clarity, although case is ignored in the interpretation of commands by the NNTP server. Any parameters are shown in lower case. A parameter shown in [square brackets] is optional. For example, [GMT] indicates that the triglyph GMT may present or omitted.
Every command described in this section must be implemented by all NNTP servers.
There is no prohibition against additional commands being added; however, it is recommended that any such unspecified command begin with the letter "X" to avoid conflict with later revisions of this specification.
Implementors are reminded that such additional commands may not redefine specified status response codes. Using additional unspecified responses for standard commands is also prohibited.