[cvsnt] Has the format of CVS Entries file changed in CVSNT > 2.0.51d?

[M.]

Hello,
I use an editor (Slickedit) that has built-in support for CVS version 
control commands and display of file version information and history 
(using the usual tree structure metaphor). It does this by a combination 
of parsing the command-line external client cvs.exe output and reading 
the actual contents of CVS sandbox control files Root, Repository, and 
Entries. I've really only tested elementary operations (add, check 
in/out, revert, diff, history), and things seem to work alright.

At the moment I'm using CVSNT 2.0.51d, which I know is ancient, and 
would like to take advantage of some of the more recent CVSNT 
innovations such as file rename support, -k option versioning, etc., 
that are present in later versions of CVSNT. The editor's CVS support 
won't display any extra information associated with these new features 
(using the command-line client is fine for that), but I don't want the 
presence of these new features to confuse the output parsing, nor any 
changes in the format of the CVS sandbox control files to invalidate the 
editor's assumptions about the information they contain.

Also, am I right in assuming 1) on the server side, that CVSNT server 
repository formats are not backward compatible, so that once upgraded by 
use of a more recent version of CVSNT, there is no going back to an 
earlier version (2.0.51d in my case), and 2) on the client sandbox side, 
that one cannot and should not mix earlier and later clients in the same 
sandbox? (The earlier one used by the editor, so as not to confuse it, 
and the later client used for the new features.)

Any illumination of these matters much appreciated.

M.