This section briefly describes protocol elements which are obsolete. There is no attempt to document them in full detail.
There was a Repository request which was like Directory except it only provided repository, and the local directory was assumed to be similarly named.
If the UseUnchanged request was not sent, there was a Lost request which was sent to indicate that a file did not exist in the working directory, and the meaning of sending Entries without Lost or Modified was different. All current clients (CVS 1.5 and later) will send UseUnchanged if it is supported.