The following are part of every known implementation of the CVS protocol
(except obsolete, pre-1.5, versions of CVS) and it is considered
reasonable behavior to completely fail to work if you are connected with
an implementation which attempts to not support them.  Requests:
Root, Valid-responses, valid-requests,
Directory, Entry, Modified, Unchanged,
Argument, Argumentx, ci, co, update.
Responses: ok, error, Valid-requests,
Checked-in, Updated, Merged, Removed,
M, E.
A server need not implement Repository, but in order to interoperate
with CVS 1.5 through 1.9 it must claim to implement it (in
Valid-requests).  The client will not actually send the request.
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