After a command which expects a response, the server sends however many of the following responses are appropriate. The server should not send data at other times (the current implementation may violate this principle in a few minor places, where the server is printing an error message and exiting---this should be investigated further).
Any set of responses always ends with `
error' or `
indicates that the response is over.
Patched are refered to as file updating responses, because
they change the status of a file in the working directory in some way.
referred to as file update modifying responses because they modify
the next file updating response. In no case shall a file update
modifying response apply to a file updating response other than the next
one. Nor can the same file update modifying response occur twice for
a given file updating response (if servers diagnose this problem, it may
aid in detecting the case where clients send an update modifying
response without following it by a file updating response).